Question

When a gas undergoes adiabatic expansion, it gets cooled. This is because:

• A. it is an exothermic process
• B. it is an endothermic process
• C. internal energy of the system decreases
• D. ideal gas becomes a real gas

Answer 1

The correct option is C internal energy of the system decreases

During adiabatic expansion,the gas is allowed to expand quickly work is done by the gas during its expansion.So,its internal energy decreases.As heat can't be enter the same system for the surroundings,the temperature of gas falls.