First law at constant volume: decide correctness of the statement Statement: “When a gas is heated at constant volume, the heat supplied increases the internal energy of the gas.”
Mechanical Engineering
Thermodynamics
Difficulty: Easy
Choose an option
-
AAgree (true statement)
-
BDisagree (false statement)
-
CTrue only for ideal gases
-
DFalse unless pressure is constant
Answer
Correct Answer: Agree (true statement)
Explanation
Concept/Approach
- At constant volume, boundary work is zero: W = ∫ p dV = 0.
- First law: Q = ΔU + W ⇒ Q = ΔU. Heat supplied raises internal energy.
Final AnswerAgree — the heat at constant volume increases internal energy.