Application Database: Compressed Air Use in the Food & Beverage Industry

EXAIR uses many different methods to connect with our customers.  We have our website, social media, blogs, publications etc. We like to share solutions for some of the most common pneumatic problems in the industry.  EXAIR generated a large collection of application information where EXAIR products have already solved problems and improved processes.  We organized them by Application and by Industry.  In this blog, I will show you how to use the Application database; specifically, for the Food and Beverage Industry.

Compressed Air Systems are considered to be a fourth utility within industries because they use a large amount of energy.  Whether an air compressor uses fuel for portable units or electricity, it is important to use this system as efficiently as possible.  This would apply to the Food and Beverage industry.  EXAIR has a library of different processes in which we already improved these areas safely and efficiently.  If you are in the Food and Beverage industry, it would benefit you to take a peek at the implementations where we already improved, establish OSHA safety, and saved money.

Here is how you can find this library.  First, you will have to sign into EXAIR.  Click here: Log In.  Once you fill in the proper information, you can then retrieve a great amount of resources about EXAIR products that we manufacture.   The Application Database is under the Knowledge Base tab.  (Reference photo below).

At the Application Search Library, we have over one thousand application that we reference.  In the left selection pane, we organized then in alphabetical order under two categories, Applications and Industry.   (Reference photo below).

Scroll down in the selection pane until you come to the sub-category: Industry.  Under this Sub-category, you will find three selections that are related to this blog: Food and Beverage, Food Packaging, and Food Processing.  We have other applications that may relate to your process like; Beverage Bottling and Beverage.  You will find many applications that EXAIR has already helped to improve and it is documented.

Why is this important?  If you are a plant manager or owner, the value of the Application Database can improve your current processes with pre-qualified results.  Within the Food and Beverage industry, simple solutions can be found to address those “nagging” issues that you see every day.  For crisis situations and shutdowns, EXAIR categorized these applications in a way to reference quickly and easily.  And since EXAIR has a high volume of stocked quality items, we can get the parts to you very fast; minimizing downtime.

In today’s market, companies are always looking for ways to cut cost, increase productivity, and improve safety.  EXAIR can offer engineered products to do exactly that.  With the “been there and done that” solutions already described in the Application Database; you can have confidence in finding a way in solving pneumatic issues.  If you do not sign up at www.EXAIR.com and take advantage of these offerings, you will be missing out on a great tool in optimizing your compressed air system.

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

 

 

Why Use EXAIR Super Air Knives: Return on Investment

Return on Investment, or ROI, is the ratio of profit over total investment.  Many people use it to check stocks, financial markets, capital equipment, etc.  It is a quantitative way in determining the validity for an investment or project.   You can use the ROI value to give a measurable rate in looking at your investment.  For a positive ROI value, the project will pay for itself in less than one year.  Any negative values would represent a high-risk investment.  In this blog, I will compare the ROI between an EXAIR Super Air Knife to a common drilled pipe.  Let’s start by looking at Equation 1 to calculate the Return on Investment:

Equation 1:  ROI = (Total annual savings – Total Project Cost) / Total Project Cost * 100

The Total Project Cost is the cost of the product with the labor to install.  In our example, we will use a 24” (610mm) wide blow-off device.  One device will be an inexpensive drilled pipe and the other will be a high-efficiency EXAIR Super Air Knife.  The drilled pipe had (48) 1/16” (1.6mm) diameter holes spaced ½” (13mm) apart.  EXAIR manufactures the model 110024 Super Air Knife with a .002” (.05mm) slot along the entire length.  Both have a blowing width of 24” to cover the conveyor.  The model 110024 has a retail price of $491.00 each.  The cost of the drilled pipe was around $50.00.  What a difference in price!  But, how could EXAIR remain a leader in this industry for over 35 years?

Let’s continue on with the Return on Investment.  The amount of time required to install the Super Air Knife across the conveyor only took a maintenance staff about one hour to mount.  The labor rate that I will use in this example is $75.00 per hour (you can change this to your current labor rate).  The labor cost to install the knife is $75.00.   The Total Project Cost can be calculated as follows: ($491 – $50) + $75.00 = $516.00.  The next part of the equation, Total annual savings, is a bit more in-depth, but the calculation is shown below.

Super Air Knife

EXAIR manufactures engineered products to be efficient and safe.  The Super Air Knife has a 40:1 amplification ratio which means that 40 parts of “free” ambient air is entrained for every 1 part of compressed air.  For comparison, the Super Air Knives are to compressed air systems as LED lightbulbs are to electricity.  In that same way, the drilled pipe would represent an incandescent lightbulb.  The reason for this analogy is because of the amount of energy that the EXAIR Super Air Knives can save.  While LED lightbulbs are a bit more expensive than the incandescent lightbulbs, the value for the Return on Investment is at a higher percentage, or in other words, a short payback period.  On the other hand, the drilled pipe is less expensive to make, but the overall cost for using it in your compressed air system is much higher.  I will explain how below.

To calculate the Total Annual Savings, we will use the same blow-off scenario as above.  The amount of compressed air used by the drilled pipe is around 174 SCFM (4,924 SLPM) at 60 PSIG (4.1 Bar).  The model 110024 Super Air Knife has an air consumption of 55.2 SCFM (1,563 SLPM) at 60 PSIG (4.1 Bar).  At an electrical rate of $0.08 per Kilowatt-hour, we can figure the cost to make compressed air.   Based on 4 SCFM per horsepower of air compressor, the electrical cost is $0.25 per 1000 standard cubic feet, or $0.25/1000SCF.  To calculate an annual savings, let’s use a blow-off operation of 8 hours/day for 250 days a year.   Replacing the drilled pipe with the model 110024 Super Air Knife, it will save you (174 SCFM – 55.2 SCFM) = 121.8 SCFM of compressed air.  To put this into a monetary value, the annual savings will be 121.8 SCFM *$0.25/1000SCF * 60 Min/hr * 8hr/day * 250 day/yr = $3,654 per year.

With the Total Annual Cost and the Project Cost known, we can insert these values into Equation 1 to calculate the ROI:

ROI = (Total annual savings – Total Project Cost) / Project Cost * 100

ROI = ($3,654 – $516.00) / $516.00 * 100

ROI = 608%

With a percentage value that high, we are looking at a payback period of only 52 days.  You may look at the initial cost and be discouraged; but in a little over a month, the model 110024 will have paid for itself.  And after using it for one year, it will save your company $3,654.00.  Some things that may be overlooked are safety issues.  With some inexpensive blow-off devices, the noise levels are over the OSHA limits.  The drilled pipe had a noise level of 91 dBA while the Super Air Knife only had a noise level of 65 dBA.

In my experience, a loud blowing noise from your equipment is generally coming from an inefficient and safety-concerned product.  With these “cheap” ways to blow compressed air, it will cost your company a lot of money to use as shown in the example above.  If you would like to team up with EXAIR to set up ways to increase savings, improve productivity, and promote safety, an Application Engineer can help you to get started.

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

Solving Static and Increasing Print Quality on Food Packaging

Gen4 Static Eliminators

A yogurt company printed bar codes on every cup that they produced. This was necessary for registering and tracing their product. After failing a bar code reader quality test, they started noticing some print issues during batch runs. They would have to stop their system, clean the inkjet printer head, and scrap product that would not register with the bar code reader.

This affects production rates, scrap rates, and overall cost. They stated that they threw away 30 to 40 cases per batch of yogurt due to this problem. They had an EXAIR catalog where they found a similar application within our Gen4 Static Eliminator product line. They contacted us to see if we could find a solution.

With non-conductive material like plastic, static is easily generated; especially during cooler weather. Static can be in a negative state or a positive state dependent on the material. For opposite charges, things are attracted to each other and will “stick” like magnets. For similar charges, they will repel each other. The higher the static charge, the stronger the force.

For the company above, the yogurt cups moved along a 7” (178mm) wide conveyor before they reached the bar code printer. This movement causes static to be generated on the surface of the cups. But, what about the inkjet printer? The function of the printer charges the ink droplets for direction and positioning. Since the ink droplets and the cup surfaces have the same charge, the droplets were being “pushed” back toward the printing head (reference photo below). Thus, the ink would dry on the surface and affect the quality of the bar code.

Bar Code Printer

When it comes to removing static, EXAIR is a leader in this market. We have a large product line of different types of Static Eliminators. Our design generates both positive and negative ions to remove any type of static charge. Since we only had to remove the static from the surface of the cup, I recommended a Gen4 Ionizing Bar. With a quick static decay rate, we can remove the static right before the bar code printer with only one Gen4 Ionizing Bar. For this application, I recommended the model 8003 3” Gen4 Ionizing Bar and a model 7960 Gen4 Power Supply. Together, it was very easy to mount and start using. EXAIR stocks lengths from 3” (76mm) up to 108” (2743mm), and we can ship a solution the same day. When you are losing 30 to 40 cases, time matters. And for this company, they received the items the next day to correct the misprints and short printing runs.

Gen4 Ionizing Bar w/ power supply

When problems occur, time can be of the essence. This is why EXAIR stocks our cataloged items for fast delivery.  For the company above, they had an EXAIR catalog which helped them to find a solution. If you would like to have an EXAIR catalog, you can click here to get one.   After they started using the Ionization Bar, the static was removed, the bar code was clean, and the operation ran smoothly. If static is causing issues for you, you can contact EXAIR and speak to one of our Application Engineers. We will be happy to assist you.

John Ball
Application Engineer

Email: johnball@exair.com
Twitter: @EXAIR_jb

EXAIR Chip Vac Systems: Overview

 

When it comes to industrial vacuums, wouldn’t it be nice to have a durable, long lasting vacuum that is quiet? There is such an industrial vacuum that has all these qualities; the EXAIR Chip Vac System. This vacuum system has no moving parts, no motors to fail, or bearings to wear. They only need compressed air to operate. The Chip Vac Systems are very durable to clean surfaces, floors, and fixtures within industries like machining centers, saw mills, lathes and other areas. They can pick up solid materials like aluminum chips, wood chips, and plastic fragments. The vacuum pumps can generate a strong vacuum level measuring -36.8” H2O (-9 KPa) at 80 PSIG (5.5 Bar). To accommodate the multiple types of industrial applications, EXAIR offers the Chip Vac Systems with different options and drum sizes.

The unique design of the Chip Vac incorporates a modified lid that will fit on an open top 55-gallon, 30-gallon, or 110-gallon drum (209L, 114L, or 418L respectively). A 0.1-micron filter bag mounts in the center of the lid to allow the excess air to escape and to contain the contamination inside the drum. The large surface area of the filter bag allows for extended use before replacement while the high-efficiency filtration will keep the fine particles from re-entraining back into the environment. Under the drum lid, EXAIR adds a silencing hose which reduces the noise level and directs the contamination toward the bottom of the drum. With this feature, the noise level is only 77 dBA at 80 PSIG (5.5 bar). Measure that against any electric shop vac!!!

Model 6193 System

The Chip Vac Systems come in three different options to best fit your application. The standard option has a drum lid as described above and a latching ring to attach to the drum. It also comes with 10-foot (3m) vacuum hose, an aluminum chip wand, a hose hanger, a manual valve, (2) extension wands and an assortment of plastic tools. This option is available for the three different drum sizes as noted above. For example, model 6193 will fit a 55-gallon drum (209L) size, model 6193-30 will fit a 30-gallon drum (114L) size, and model 6193-110 will fit a 110-gallon drum (418L) size.

Deluxe Chip Vacs

The second option is the Deluxe Chip Vac System. This option will include all the items in the standard option above plus a drum dolly and a tool holder. The drum dolly helps to move your drums to different locations. The tool holder has magnets to attach to a steel drum and to hold all the plastic tools. The Deluxe system is a great option for making your system mobile for other areas in your plant. This option is also available in the three main drum sizes like above. For example, model 6293 is for the 55-gallon drum (209L), model 6293-30 is for the 30-gallon drum (114L) and model 6293-110 is for the 110-gallon drum (418L).

If you do not have any drums in your facility, do not worry. EXAIR offers steel drums in our Premium Chip Vac Systems. The Premium package has the items in the standard option plus a variety of upgrades. It will come with a heavy-duty steel drum for all sizes. The upgrades include the heavy duty aluminum tools and an anti-static vacuum hose. The upgraded aluminum tools include a floor tool, crevice tool, skimmer tool with detachable brush, and a two-piece double bend wand. We also add a 20 foot (6.1meter) compressed air hose with quick connect fittings. The Premium package will still come with the drum dolly and tool holder. These can be ordered by using the model 6393 for the 55-gallon drum (209L) size, model 6393-30 for the 30-gallon drum (114L) size, and model 6393-110 for the 110-gallon drum (418L size).

Mini Chip Vac

EXAIR manufactures another type of industrial vacuum within this family; the Mini-Chip Vac System. This system is a self-contained unit that uses a 5-gallon drum which is very compact and easy to use in tight areas. We stock two packages, model 6193-5 and model 6293-5. The model 6193-5 comes standard with a 5-gallon drum with lid and lock-ring, 10-foot (3m) vacuum hose, the 0.1-micron bag filter, an aluminum chip wand, a manual valve, (2) extension wands and an assortment of plastic tools. The model 6293-5 adds a drum dolly to the package to make it mobile with wheels. Even with its small footprint, the Mini Chip Vac is very powerful and quiet. So, noise will not be a nuisance when operating next to the vacuum.

If you get tired of throwing away your electric vacuums with burned up motors or loud “dying” noises, you should try the EXAIR Chip Vac System. They will definitely extend the useful life, make it much quieter to use, and vacuum solid materials quickly. For U.S. and Canadian customers, we offer a 30-day unconditional guarantee to try these units. And as a bonus for end users, you will be able to receive a free Vac-u-Gun as a promotion from now until May 2020 with a qualified purchase. How can you not try them out? If you need help to determine which Chip Vac System would best suit your application, you can contact an Application Engineer at EXAIR.

John Ball
Application Engineer

Email: johnball@exair.com
Twitter: @EXAIR_jb

EXAIR, Manufacturing Locally Equals Quick Customizations

Dryer with corn cob material

A manufacturing company contacted EXAIR about their metal tube processing. They made industrial precision tubes from start to finish. This would include turning, cutting, coating, washing and drying metal tubes to specific diameters and lengths.

For one specific problem area, they manufactured a tube with the dimensions of 1” (25.4mm) in diameter and 6” (152mm) in length. They would run a batch of 750 tubes through a wash cycle and then through a vibrating dryer with a drying material made from corn cobs. At the bottom of the vibrating dryer, the tubes would fall to an open mesh shaker table to transfer the tubes to Quality Control. The idea was to remove the excess cob material from the surface of the tubes before inspection and to recycle the drying material. But the problem was static.

When non-conductive materials slide, hit, peel, and vibrate; electrons from the surface can move from one atom to another; thus, creating static. The type of material and the amount of movement governs the positive and negative charges, and the amount of static forces.

The corn cob material is a non-conductive material, but what about the metal tubes? Since the metal tubes were coated for corrosion and abrasion protection, the surface is now a non-conductive area which will contain static. Since opposite charges attract each other, the cob material would cling to the outside surface of the metal tubes (reference photo below). Being a precision tube manufacturer, they did not want to send “dirty” tubes to their customers or allow the drying material to contaminate their measuring equipment. And, with the required quality control, the measurements had to be exact.

Tubes with cob material

The shaker table was 8 feet (2.4 meters) long and 2 feet (0.6 meter) wide with rigid walls. The top of the shaker table was covered with a canvas to allow for a vacuum system to collect the excess material and dust. About half way down, there was a 2” (51mm) drop to help jolt additional cob material off of the tubes as they landed. But the static forces were too strong to release the material. Thus, the static had to be removed from the surface, so they contacted EXAIR to see if we could find a solution.

They sent photos of their setup which always helps us to diagnose and find solutions. The target place that they suggested would be near the 2” (51mm) drop as the tubes would be suspended for just a moment. My recommendation was to use a Gen4 Super Ion Air Knife to blow ionized air around the tubes as they fell. By blowing air, we can use the non-contact force to remove the static and the cob material at the same time. But we had two issues to overcome. The width was fixed at 2 feet (0.6 meter), and the operation controls were 10 feet (3 meters) away from the mid-section of the shaker table.

Gen4 Super Ion Air Knives

EXAIR stocks many Gen4 Super Ion Air Knives ranging from 3” (76mm) to 108” (2.74meters) in incremental lengths for quick shipments. But our standard 24″ product was not able to fit inside that area nor was the five foot electrical cable long enough to reach the control panel. (As a note, it was important for the operator to be able to manually turn on and off the unit from the control panel.)

EXAIR uses an electromagnetically shielded cable to carry high voltage from our Gen4 Power Supply to our shockless, non-radioactive Gen4 Ionizing Bar. Our  stocked length for our armored cable is 5 feet (1.5 meter). After discussing the amount of movement with the table and the desired distance to the control panel, EXAIR could not use an item off the shelf. But not to worry… Since we are the manufacturer, we have the ability to make a special design for this customer.

Super Ion Air Knife Part Numbering System

I recommended a model 112220-10 special length Gen4 Super Ion Air Knife Kit. (Reference model numbering system above). Specials are non-returnable and non-cancelable, but for this customer, it was exactly what they needed. The Gen4 Super Ion Air Knives are engineered to efficiently blow ionized air to the target and remove static charge and debris.

For this special model, it was made to a specific width where the Super Air Knife was manufactured to a length of 20” (508mm), and the high voltage cable was lengthened to 10 feet (3 meters). The kit includes the Gen4 Power Supply to power the Ionizing Bar, a filter to clean the compressed air, a regulator to control the force, and a shim set to change force rates. This complete kit had everything required to begin operations to remove static and cob material from their precision tubes. The customer was able to mount the special length Gen4 Super Ion Air Knife within the shaker table and mount the power supply near the control panel.

Static can be an issue even with coated metal parts. For the customer above, EXAIR was able to make a special length Gen4 Super Ion Air Knife to work in their system. If you believe that static is causing issues, EXAIR has a great range of Gen4 Static Eliminators to remove that nuisance. You can discuss further with an Application Engineer as EXAIR for help; even if you need a custom product.

John Ball, Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

Gen4 Static Eliminators: Cleaning as a Preventative Maintenance

The Gen4 Static Eliminators have been successful for EXAIR because of our robust design and great performance. They are rugged enough to be used in many industrial areas. EXAIR manufactures two styles; with and without compressed air assistance. For both types, preventative maintenance is still required to keep the Gen4 product line functioning optimally. In this blog, I will describe how to clean the points for years of hassle-free operations.

There are two common ways that an anti-static product will start to drift; contamination buildup and emitter point degradation. The degree of buildup is dependent on the environment. To create an ion, we have to apply a high voltage to a fine point. The high voltage is supplied by our Gen4 Power Supplies which generate 5,000 volts from a selectable 115Vac or 230Vac input. As the high voltage is pushed into a fine point; the energy creates a corona field.

Any contamination near or around that point can collect on its tip. The more contamination in the surrounding area, the faster the buildup will occur. Once the point gets coated, the ion production begins to decrease. Before this happens, the points should be cleaned with a soft-bristled brush as a preventative maintenance. Make sure that the power is turned off to the power supply and please do not use any liquid or cleaners on the points.

The second way is caused when the ionizing tips start to lose its sharpness caused by the cycle rate of ion production. Like a wick in a candle, a bit of material is lost over time. To mitigate this, our resistor-based line has replaceable ion points. This feature makes a cost-effective way to keep the points sharp, and the Static Eliminators like new. The video below shows how to clean and replace the ion points.

For any analysis with the Static Eliminators, EXAIR offers a model 7905 Static Meter. The Static Meter can help to find problem areas for best placement for the Gen4 Static Eliminators. It can also help to diagnose any static issues when cleaning is required and to help decide a preventative maintenance schedule. Whether is it a single point or multiple point product, the video above will help you to keep your machines running smoothly.

“An ounce of prevention is worth a pound of cure.”   With a maintenance schedule and a soft-bristled brush, you can protect your equipment from many issues with static. This would include machines jamming, difficult alignments, collection of debris, and hazardous shocks. EXAIR has a large line of Gen4 Static Eliminators to remove these static nuisances, and with the cleaning instructions above, you will have years of effective static removal. If static is affecting your operation, you can contact an Application Engineer at EXAIR to help select the correct solution.

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

People of Interest: Daniel Bernoulli

Daniel Bernoulli

Whenever there is a discussion about fluid dynamics, Bernoulli’s equation generally comes up. This equation is unique as it relates flow energy with kinetic energy and potential energy. The formula was mainly linked to non-compressible fluids, but under certain conditions, it can be significant for gas flows as well. My colleague, Tyler Daniel, wrote a blog about the life of Daniel Bernoulli (you can read it HERE). I would like to discuss how he developed the Bernoulli’s equation and how EXAIR uses it to maximize efficiency within your compressed air system.

In 1723, at the age of 23, Daniel moved to Venice, Italy to learn medicine. But, in his heart, he was devoted to mathematics. He started to do some experiments with fluid mechanics where he would measure water flow out of a tank. In his trials, he noticed that when the height of the water in the tank was higher, the water would flow out faster. This relationship between pressure as compared to flow and velocity came to be known as Bernoulli’s principle. “In fluid dynamics, Bernoulli’s principle states that an increase in the speed of fluid occurs simultaneously with a decrease in static pressure or a decrease in the fluids potential energy”1. Thus, the beginning of Bernoulli’s equation.

Bernoulli realized that the sum of kinetic energy, potential energy, and flow energy is a constant during steady flow. He wrote the equation like this:

Equation 1:

Bernoulli’s Equation

Not to get too technical, but you can see the relationship between the velocity squared and the pressure from the equation above. Being that this relationship is a constant along the streamline; when the velocity increases; the pressure has to come down. An example of this is an airplane wing. When the air velocity increases over the top of the wing, the pressure becomes less. Thus, lift is created and the airplane flies.

With equations, there may be limitations. For Bernoulli’s equation, we have to keep in mind that it was initially developed for liquids. And in fluid dynamics, gas like air is also considered to be a fluid. So, if compressed air is within these guidelines, we can relate to the Bernoulli’s principle.

  1. Steady Flow: Since the values are measured along a streamline, we have to make sure that the flow is steady. Reynold’s number is a value to decide laminar and turbulent flow. Laminar flows give smooth velocity lines to make measurements.
  2. Negligible viscous effects: As fluid moves through tubes and pipes, the walls will have friction or a resistance to flow. The surface finish has to be smooth enough; so that, the viscous effects is very small.
  3. No Shafts or blades: Things like fan blades, pumps, and turbines will add energy to the fluid. This will cause turbulent flows and disruptions along the velocity streamline. In order to measure energy points for Bernoulli’s equation, it has to be distant from the machine.
  4. Compressible Flows: With non-compressible fluids, the density is constant. With compressed air, the density changes with pressure and temperature. But, as long as the velocity is below Mach 0.3, the density difference is relatively low and can be used.
  5. Heat Transfer: The ideal gas law shows that temperature will affect the gas density. Since the temperature is measured in absolute conditions, a significant temperature change in heat or cold will be needed to affect the density.
  6. Flow along a streamline: Things like rotational flows or vortices as seen inside Vortex Tubes create an issue in finding an area of measurement within a particle stream of fluid.
Super Air Knife has 40:1 Amplification Ratio

Since we know the criteria to apply Bernoulli’s equation with compressed air, let’s look at an EXAIR Super Air Knife. Blowing compressed air to cool, clean, and dry, EXAIR can do it very efficiently as we use the Bernoulli’s principle to entrain the surrounding air. Following the guidelines above, the Super Air Knife has laminar flow, no viscous effects, no blades or shafts, velocities below Mach 0.3, and linear flow streams. Remember from the equation above, as the velocity increases, the pressure has to decrease. Since high-velocity air exits the opening of a Super Air Knife, a low-pressure area will be created at the exit. We engineer the Super Air Knife to maximize this phenomenon to give an amplification ratio of 40:1. So, for every 1 part of compressed air, the Super Air Knife will bring into the air streamline 40 parts of ambient “free” air. This makes the Super Air Knife one of the most efficient blowing devices on the market. What does that mean for you? It will save you much money by using less compressed air in your pneumatic application.

We use this same principle for other products like the Air Amplifiers, Air Nozzles, and Gen4 Static Eliminators. Daniel Bernoulli was able to find a relationship between velocities and pressures, and EXAIR was able to utilize this to create efficient, safe, and effective compressed air products. To find out how you can use this advantage to save compressed air in your processes, you can contact an Application Engineer at EXAIR. We will be happy to help you.

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

  1. Wikipedia https://en.wikipedia.org/wiki/Bernoulli%27s_principle