#### • Class 11 Physics Demo

Explore Related Concepts

# Air Exerts Pressure Experiments

Air exerts pressure experiments are an important tool which describes the role of air in exerting the pressure with related experiment. By the experiments, it is very easy to understand the concepts of problem. Experiment can be simple or complex. But to understand the phenomenon the experiment shall be as simple as possible. To conduct experiment it is always important to understand the basic concept and arrange all necessary equipments required for conducting the experiment.  Now to understand about air exerts pressure experiments, we will take very simple experiment. The same simple experiment is described below:

Let us understand how air exerts pressure by the simple experiment. For conducting the experiment, following equipments are required which are as follows:
1) Tin can with the covering lid.
2) A tripod stand
3) Burner and
4) Water

With the help of above equipments, we will conduct air exerts pressure experiments. Steps of the experiments are given below:
1) First of all it is required to fill half of the tin can with water.
2) Then you have to light the burner. The next step is to place the tripod above the burner such that the burner is in the center position of the tripod stand.
3) Then you have to place the tin can on the tripod stand. After that you have to wait till the water boils.
4) After that you have to extinguish the burner and then after you to closed the lid of the tin can.
5) After this the closed lid tin can shall be placed under the running water. You can place just below the tap of the water.
6) After carefully observing the tin can, you will see that the can shape is distorted. The important question here is why the tin can shape distorted.

The reason for the change in the shape of can is the pressure which is decreasing in the tin can. Once we place the above tin can under running water, the condensation process takes place. Because of the condensation some steam inside the tin can is condensed into the water, which actually decreases the air pressure inside the tin can.  In this position the pressure inside the tin can is less the pressure from outside the can. And this external higher pressure compressed the can and hence the shape of the can is distorted.

So the air exerts pressure experiments are clear from the above example. It is now very clear from above example that air exerts a pressure. In above example we have seen that when steam is condensed the shape of can implode, because of the higher external pressure. And when the steam is not condensed inside, than in that case there is no problem of implosion.  This experiment clearly indicates that air exerts a pressure. It is also important to note that the whenever there is increase in the wind speed, there is always a reduction in the air pressure accompanying it. This is also one of the important basic conceptual points to understand various other air pressure experiments.

Question:chemistry basic question, just need other ideas. please answer with any experiment that demonstrates that air exerts pressure, and how. thank you!

Question:1. Inflating a ballon and weighing the mass of it and then releasing the most of the gas from the balloon and weighing the mass of it. 2. Placing an empty drinking glass in a container of water with its end facing downward and tilting it. 3. inserting an unused balloon in a bottle and then blowing it up in the bottle. 4. inflating 2 balloons and putting one in ice water and the other in boiling water.

Answers:1- prove it is a matter ( it has a mass so it is a matter) 2- if u do the secon one ull see water can not get in the glass (try it at home) so it means it exerts a pressure more than the water to keep it out. 3- i didnt understan what does it say 4- in these case the one in the ice will get smaller becaeuse of the cold and the one in the boilin water will expand it also proves that it is a matter it expands with heat and streches with cold

Question:1. Placing a boiling hot aluminum can in ice water. 2. Filling a test tube with water and putting a piece of plastic on it and turning it upside down.(the water does not come out) 3. Putting in air in a syringe and putting a cap on the end, later holding the cap in placegently pushing the plunger down with your thumb and releasing the plunger. 4. Putting an unused balloon inside a bottle and then trying to blow it up while the balloon is in the bottle.

Answers:2 means that there is a pressure holding the water in the tube so two proves 3 three also proves it air pus the cap out so it means it exerted a pressure 4 if u exert enough pressure it will break the bottle so 4 is also checked 1 i couldnt find the relation of it with the air i dont think it does not prove not sure

Question:

Answers:mass: take a meter stick and tape two uninflated balloons on either end of the stick, marking carefully where you place the balloons...now, balance the stick (with the balloons on it) so there is equal mass on either side of the balance point... carefully remove ONE of the balloons, and blow it up, being very careful to retape it to the same spot it was on before now you will see that the meter stick is NOT balanced and tilts in the direction of the inflated balloon, showing there is additional mass in the balloon once you have inflated it pressure: take a meter stick and place it on a table with a small portion of it hanging over the edge take a newspaper and use the newspaper to cover up the meter stick that is still on the table..make sure you cover all of the meter stick...now, squeeze out all the air from underneath the paper once you have done that, see what happens when you "chop down" on the overhanging portion of the stick...it will barely move no matter how hard you hit it...in fact, if you did a really good job squeezing out the air from underneath the paper, you might snap the stick in two this is because the pressure of the air is bearing down on the surface area of the paper, holding the meter stick down