Thermal physics

Question 1

Absolute zero

Answer 1

The substance has minimal internal energy

Question 2

Thermal equilibrium

Answer 2

objects in contact with each other at the same temperature, so no net heat flow between them

Question 3

Internal energy

Answer 3

Sum of the randomly distributed kinetic energies

Question 4

Brownian motion

Answer 4

The random movement of small visible particles suspended in a fluid due to collisions with smaller random moving particles.

Question 5

Specific heat capacity

Answer 5

Amount of energy needed to raise the temperature of 1 Kg of the substance by 1k.

Question 6

Specific latent heat of fusion

Answer 6

Amount of energy required to change 1Kg of substance from solid to liquid

Question 7

Specific latent heat of vapourisation

Answer 7

Amount of energy required to change 1Kg of substance from liquid to gas

Question 8

Ideal gas

Answer 8

Has internal energy only in the form of kinetic energy

Question 9

Kinetic model assumptions

Answer 9

• Gas contains large number of particles
• Particles move randomly and rapidly
• Collisions are perfectly elastic
• Negligible attractive forces
• time for collision is negligible
• Negligible volume for particles

Question 10

Boyles law

Answer 10

Volume of a fixed mass of as is inversely proportional to the pressure exerted on the gas under conditions of constant pressure.

Question 11

Charles law

Answer 11

At constant pressure, the volume V of a gas is directly proportional to its absolute temperature T or V/T=constant