Thermal physics

Question 1

1 mole (mol)

Answer 1

is the amount of substance that has the same number of particles as there are atoms in 12 g of carbon-12 isotope.

Question 2

Molar gas constant (R)

Answer 2

has the same value for all gases, 8.31 J K-1.

Question 3

Boltzmann constant (k)

Answer 3

has the value 1.38 × 10-23 J K-1.

Question 4

Ideal gas

Answer 4

is one which obeys the equation of state pV=nRT at all pressures, volumes and temperatures.

Question 5

Thermodynamic temperature scale

Answer 5

is independent of the physical properties of any particular substance.

Question 6

Specific heat capacity

Answer 6

of a material is the energy required to raise the temperature of unit mass of the material by 1 K.

Question 7

Thermal capacity

Answer 7

of a body is the energy required to raise the temperature of the complete body by 1 ◦C.

Question 8

Specific latent heat of fusion

Answer 8

is the energy required to change unit mass of solid to liquid without a change in temperature.

Question 9

Specific latent heat of vaporisation

Answer 9

is the energy required to change unit mass of liquid to vapour without a change in temperature.

Question 10

Internal energy

Answer 10

is the sum of the random distribution of the kinetic and potential energies associated with the particles of a system.