Chapter 11-13. Thermal Physics-Current of Electricity

Question 1

Define Internal Energy U

Answer 1

The internal energy is the summation of microscopic kinetic energy due to random motion of the molecules and the microscopic energy due to intermolecular forces.

Question 2

Define Zeroth Law of Thermodynamics

Answer 2

If bodies A and B are separately in thermal equilibrium with a third body C, then A and B are also in thermal equilibrium

Question 3

1. Define Specific Heat Capacity

2. S.I. Unit?

Answer 3

1. The specific heat capacity of a substance is the quantity of heat per unit mass required to raise the temperature of a unit mass of the substance by 1 unit of temperature
   Q = mc∆T
2. J kg^-1 K^-1

Question 4

Define heat capacity

Answer 4

Heat required to raise the temperature of the substance by 1 unit of temperature

Question 5

1. Define specific latent heat of vapourization

2. Define specific latent heat of fusion

Answer 5

1. The specific latent heat of vapourization Lv of a substance is the energy per unit mass required to change unit mass of the substance from the liquid phase to the gas phase without any change in temperature.
   J kg^-1
2. The specific latent heat of fusion Lf of a substance is the energy per unit mass required to change unit mass of the substance from the solid phase to the liquid phase without any change in temperature.
   J kg^-1

Question 6

1. Define First Law of Thermodynamics

2. Equation?

Answer 6

1. The increase in the internal energy of the system is the sum of the heat supplied to the system and the work done on the system
2. ∆U = Qin + Won

Question 7

Define Ideal Gas

Answer 7

An ideal gas is a gas that obeys the Equation of State for the Ideal Gas at all values of pressure, volume and temperature