Thermal Physics

Question 1

Absolute temperature

Answer 1

It is also known as absolute zero. It is the lowest possible temperature at which the kinetic energy of the molecules is zero.

Question 2

Pressure of gases

Answer 2

Pressure is directly proportional to volume
P=K/V

Question 3

Internal energy

Answer 3

The sum of KE & Potential Energies associated with the molecules of atoms of the substance.
~ When the temperature of a substance is increased its molecules move faster so the KE increases & hence the internal energy also increases
~ potential energy does not vary with the change in temperature.

Question 4

Specific heat capacity

Answer 4

The amount of thermal energy given to 1kg of a body per kg to increase the temperature by 1 degree Celsius
c= m x change in temperature
Thermal energy = mc x change in temperature

Question 5

Heat capacity

Answer 5

The amount of thermal energy given to a body to increase its temperature by 1 degree celsius

Question 6

Specific latent heat

Answer 6

The amount of heat given to a body to change one kg of a body from one state to another

Question 7

Latent heat

Answer 7

The amount of thermal energy given to a body to change it from one state to another.

Fusion: solid-liquid
Vaporisation: liquid-gas