Write the following steps of an experiment in a sequence to conclude that atmospheric air exerts pressure.
(A) Stop heating the container and cool it to very low temperatures.
(B) Take a metallic container that is half filled with water.
(C) The container gets compressed because of the pressure exerted by the air from outside the container.
(D) Heat the container for some time and place a cap on the container firmly.

Options

A. DBCA
B. BDAC
C. DABC
D. BADC

Answer

To conclude that atmospheric air exerts pressure, we can follow these steps in the correct sequence:

1. **(B)** Take a metallic container that is half filled with water.
- This is the first step as we need a container with water to start the experiment.

2. **(D)** Heat the container for some time and place a cap on the container firmly.
- In this step, heating the container causes some of the air inside to expand and escape, and by capping it, we trap the remaining air and water vapor inside.

3. **(A)** Stop heating the container and cool it to very low temperatures.
- After heating, we stop the heating process and allow the container to cool down. This cooling causes the water vapor to condense back into water, reducing the amount of air inside the container.

4. **(C)** The container gets compressed because of the pressure exerted by the air from outside the container.
- Finally, due to the reduced air pressure inside the container compared to the atmospheric pressure outside, the container gets compressed, demonstrating that atmospheric air exerts pressure.