As we know air is everywhere and we can't survive without air. It consists of various gases, dust particles, water vapors, etc. Air exerts a particular pressure on every single thing. Air pressure is calculated with the help of an instrument called barometer and according to it, the Earth's atmospheric pressure is 14.7 psi (pounds per square inch). We can't feel this pressure because it is everywhere. But if we are in a vacuum or in outer space where there is no air we have to use pressurized suits to protect our body. This is the reason why astronauts wear space suits. Here we are going to take a look at some air pressure experiments which will prove the existence of air pressure and will show that it has weight too.
Interesting Experiments to Measure Air Pressure
The experiments given below are easy to perform and need few things which are easily available at home. These air experiments for kids should be performed under the supervision of elders. Kids can also use these experiments as their physics projects.
Marshmallows Experiment
Take a glass jar and empty it completely. Add small pieces of marshmallows inside the jar and seal it with a wine vacuum cork. Attach a manual pump over the cork and try to pump as much air out of the jar as you can. This will make the marshmallows pieces swell and you will observe them growing. Now break the seal. As soon as the seal breaks and air comes rushing inside the jar, the marshmallows cramp down and return to its old size.
Water Glass Experiment
This is one of the best experiments to measure air pressure. Take a glass and fill one-third of it with water. Place a cardboard over the mouth of the glass. The cardboard should be bit bigger than the glass' mouth. Now apply some pressure on the cardboard from the left hand and invert the glass with the right hand. Slowly remove the hand and see what happens. The water does not fall from the glass, retaining the cardboard and the water in the same place as before. This takes place because the air pressure outside, i.e., 14.7 psi, is heavier than the combined weight of water and air inside the glass.
Balloon Experiment
This experiment with balloon will show you what air pressure can do. Take a balloon and blow it. Now stretch the mouth of the balloon, pinching the ends of the mouth so that you can hear a loud squeaking noise. You can also alter this sound and pitch. But the question is why a balloon makes such sounds? The reason for it is air pressure. When you stretch its mouth it leaves very little space for the air to come out. So because of the air pressure the mouth of the balloon vibrates which makes such sound. Ask someone else to perform this experiment so that you can touch below the mouth of the balloon and feel the vibration.
Egg Experiment
Take a hard-boiled egg and remove its shell. Take a bottle whose mouth is large enough to squeeze the egg inside it without squashing it but should also not easily allow the egg to enter the bottle. Now light a matchstick put it inside the bottle and immediately close its mouth with the egg. The match stick will utilize the oxygen inside the bottle and will create a low air pressure. High pressure outside the bottle will push the egg inside. This experiment with the air pressure shows how strong it can be.
Paper Experiment
Take a sheet of paper and hold the edges near to your lips. Place it at the bottom of your lips and try to blow hard. You may have to put the paper in different places to find the exact position. Now when you blow it the paper will fly up. This is because of air pressure. As you blow from the upper side of the paper it creates an area of low pressure above the paper and high pressure at the bottom of the paper. This high pressure forces it to fly in an upward direction. By this concept you can understand how do airplanes fly. They reach the height only because of air pressure.
Ping Pong Experiment
For this experiment, you will need a ping pong ball and a funnel. Place the ball in the funnel, and hold it in such a way that the wider part faces the ceiling. Now tilt your head and blow into the funnel. No matter how hard you blow the ball remains in the funnel without falling out. This happens due to the fact that the air blown at high speed decreases the pressure in the funnel. The outer air pressure also pushes the ball. Reduction in pressure inside the funnel and push from external pressure make the ball remain inside the funnel.
I hope you had a good time reading such simple, interesting and useful experiments to prove the air pressure around us. These air pressure experiments are basically for kids but elders can also enjoy doing it at home. So, try them and yes do let me know about your experiences.
To determine the pressure of 5 mL of air, we need to know the temperature and the volume of the air sample, as well as the context (e.g., whether it's in a closed container or open atmosphere). According to the ideal gas law (PV=nRT), pressure (P) can be calculated if you have the number of moles (n) of air and the temperature (T) in Kelvin. Without additional details, the pressure cannot be accurately determined. In standard atmospheric conditions, air pressure is approximately 101.3 kPa, but this does not specifically apply to just 5 mL of air without context.
air
high pressure to low pressure
Air pressure is caused by the weight of the air above pushing down on the air below. As altitude increases, there is less air above, resulting in lower air pressure. Temperature and humidity can also affect air pressure.
Altitude has a large affect on the air pressure and air density. Air density reduces with altitude and air pressure reduces with altitude as well.
You can apply alot more force with the help of air pressure
Air pressure
There is air pressure on all sides, inside or outside. The air pressure pushes on the object all ways and nothing falls. If you only apply pressure on the bottom then the object will lift. If you apply pressure on the top, the object will collapse. If air pressure is pushing side ways, the object will move sideways.
Air
A soccer ball bounces as the air particles in them hit and apply pressure at the ball, when it hits a surface, the pressure from the particles apply a force on the ball. Thus, making it bounce.
In all cars and most trucks HYDRAULIC pressure is used to apply the brakes. In an air brake system such as is found on medium and heavy duty trucks the air is actually released to apply the brakes.
Air applies pressure due to the weight of the air molecules above it pressing down. The higher up you go in the atmosphere, the less air there is above you, resulting in lower air pressure. The force of air pressure can be measured and is an important factor in weather systems and air travel.
Instead of using hydraulic brake fluid to apply the pads to the brake drums or discs, air pressure is used.
air pressure is used
Air stuck in the brake lines cause the peddle to feel "spongy". Your braking distance will dramatically increase with air in the system. When you apply the brakes in a vehicle that has no air in the system, that pressure added with the pressure from the master cylinder presses the brake pads against the rotor or drum causing you to stop. When there is air in the brake system and you apply the brakes some of that pressure is used up by compressing the air in the system and the rest is trying to stop the vehicle.
If you have air in a tight cylinder piston system, when you apply pressure you will see the volume of the air reduced. The amount of mass of air is the same, but now it occupies less volume, the molecules are closer together, its density has increased.
Apply Some Pressure was created in 2007.