Question

A rigid tank of air is cooled (temperature decreased). The volume has to remain constant because it is a rigid tank. The air pressure in the rigid tank
A. Increases B. Decreases C. Stays the same

Answer 1

The air pressure in the rigid tank Decreases.

Explanation:

A rigid tank is said to be a region where volume is always considered as a constant. During the process of cooling the rigid tank where the temperature is said to be decreased, the effect of air pressure in the tank also decreases.

Because, PV = RT, where P is the pressure, T is temperature, R is constant, V is the volume. Hence pressure is directly proportional to temperature.

Answer 2

If the temperature in the tank is decreased this would imply that the kinetic energy of molecule decreases because of the ideal gas law:
PV= nRT (Since Pressure is directly proportional to Temperature).
So the answer is B.The air pressure in the rigid tank decreases.
Hope this helps you.