Heat and Temperature

Question 1

What is temperature?

Answer 1

A physical property related to the kinetic energy of the atoms/molecules of a system

Question 2

What is the equation for linear expansion?

Answer 2

L=L0+ΔL

Question 3

What is the linear expansion coefficient?

Answer 3

α=1/L0 (ΔL/ΔT)

Question 4

What is the volume expansion coefficent?

Answer 4

β=1/V_0 * ΔV/ΔT

Question 5

How do the linear and volume expansion coefficients relate?

Answer 5

β=3α

Question 6

What are examples of materials with odd behaviour?

Answer 6

Water near 0 degrees Celsius and INVAR

Question 7

What are the assumptions of the coefficents?

Answer 7

They are constant but can change with temperature

Question 8

How is the sign of the heat flow determined?

Answer 8

If Q is heat in then positive
If Q is heat out then negative

Question 9

What is the heat capacity?

Answer 9

The amount of energy required to raise the temperature of 1kg/1mol of an object by 1 degree kelvin
Either Molar(C) or specific(c)

Question 10

What is the Molar heat capacity?

Answer 10

Q=nCΔT

Question 11

What is the specific heat capacity?

Answer 11

Q=mcΔT

Question 12

What is the latent heat?

Answer 12

The heat exchanged during a phase transition

Question 13

What is the heat flow during a phase transition?

Answer 13

Q=mL or Q=-mL

Question 14

What are the three types of heat transfer?

Answer 14

Conduction
Radiation
Convection

Question 15

What is the heat conduction along a rod?

Answer 15

dQ/dt=-ΚA dT/dx

Question 16

How is heat conduction conserved in a rod?

Answer 16

At each vertex the heat conduction is conserved
e.g. (dQ_1)/dt=(dQ_2)/dt+(dQ_3)/dt

Question 17

What is the power radiated by a body?

Answer 17

P=εσAT^4 where ε is the surface emissivity and σ is the Stefan Boltzmann constant