Objective 03: Specific Heats for Constant Volume and Constant Pressure Flashcards
1
Q
Specific Heat
A
The amount of heat required to raise the temperature of a unit quantity of a substance by 1 degree
2
Q
How many specific heats are assigned to solids and liquids?
A
1
3
Q
How many specific heats are assigned to a perfect gas?
A
2
4
Q
What are the 2 specific heats that are assigned to a perfect gas?
A
- Specific Heat under Constant Volume (CV)
- Specific Heat under Constant Pressure (CP)
5
Q
Why are there 2 specific heats assigned to a perfect gas?
A
- At constant volume, no work is performed by the gas as it is heated and therefore less heat is required to raise it a certain temperature
- At constant pressure, some of the heat provided to a gas is used to perform work by the gas on its surroundings as it expands and therefore more heat is required to raise it to a certain temperature
6
Q
Which is greater, the specific heat of a gas under constant volume (CV) or constant pressure (CP)?
A
CP
7
Q
What is the relationship between the Characteristic Gas Constant (R) and the specific heat of gas at constant pressure (CP) and constant volume (CV)?
A
R = CP - CV
