First Law of Thermodynamics definitions

Question 1

(Specific) Heat capacity

Answer 1

The (specific) heat capacity of a body is the quantity of heat required (per unit mass) to cause a unit rise in temperature of the body

Question 2

Specific latent heat of fusion

Answer 2

The specific latent heat of fusion is the quantity of heat required to convert unit mass of solid to liquid without any change of temperature

Question 3

Specific latent heat of vaporisation

Answer 3

The specific latent heat of vaporisation is the quantity of heat required to convert unit mass of liquid to gas without any change in temperature

Question 4

Internal energy

Answer 4

The internal energy of a system is the sum of microscopic kinetic energy, due to the random motion of the molecules, and the microscopic potential energy, associated with the intermolecular forces of the system

Question 5

First law of thermodynamics

Answer 5

The first law of thermodynamics states that the increase in the internal energy of a system is equal to the sum of the heat supplied to the system and the work done on the system, and the internal energy of a system depends only on its state