10 First Law of Thermodynamics

Question 1

First Law of Thermodynamics

Answer 1

In a closed system, the increase in internal energy is equal to the heat supplied to the system and the work done on the system. ΔU = Q + W

ΔU: increase in internal energy

Q: heat supplied to the system

W: work done on the system

Question 2

What do the following processes mean?

Isothermal

Isovolumetric

Isobaric

Adiabatic

Answer 2

Isothermal - Temperature is kept constant (ΔU = 0)

Isovolumetric - Volume is kept constant (W = 0)

Isobaric - Pressure is kept constant (W = -pΔV)

Adiabatic - No heat is transferred (Q = 0)