Question

If a gas, at constant temperature and pressure expands, then its:

• A. entropy increases and then decrease
• B. internal energy increases
• C. internal energy remains the same
• D. internal energy decreases

Answer 1

The correct option is C internal energy remains the same

We know that internal energy of a gas depends upon its pressure and temperature. Thus if a gas expands at constant temperature and pressure, than its internal energy remains same.