Question

An ideal gas is compressed at constant temperature will it is internal energy increase or decrease

Answer 1

In the isothermal compression of a gas there is work done on the system to decrease the volume and increase the pressure. Doing work on the gas increases the internal energy and will tend to increase the temperature. To maintain the constant temperature energy must leave the system as heat and enter the environment.

Answer 2

When an ideal gas is compressed at constant temperature then its internal energy will not change.

Explanation:

• Internal energy is defined as the sum of total potential and kinetic energy present within a closed system. Internal energy is represented by the symbol $\Delta U$.

• Internal energy is only dependent upon temperature. So, then we keep the temperature constant then any change in pressure or volume of the system will not cause any change in the internal energy of the gas.

• This means that internal energy of the gas will remain the same when temperature is kept constant.

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