Chapter 2 Energy Transfer By Heating

Question 1

What is thermal conductivity

Answer 1

the rate at which a material transfers heat energy

Question 2

Materials in order of thermal conductivity
Glass
Iron
Copper
Aluminium
(Most to least)

Answer 2

Copper
Aluminium
Iron
Glass

Question 3

What is thermal conduction

Answer 3

The process where energy is transferred by vibrating particles in a substance, these vibrating particles transfer energy from their kinetic store to the kinetic stores of surrounding particles, the direction of this energy transfer is always from hot to cold along a temprature gradient

Question 4

What is insulation

Answer 4

The ability to reduce the rate of energy transfer across a material

Question 5

What factors does the rate of energy transfer across a material depend on

Answer 5

The temprature of difference across the material
The thickness of the material
The thermal conductivity of the material

Question 6

What is specific heat capacity

Answer 6

The energy needed to raise 1kg of a material by 1°C

Question 7

Specific heat capacity equation

Answer 7

Specific heat capacity(j/kg°c)= energy(j) / mass(kg) x change in temprature(°C)

C=e / M x change in temp

Question 8

What is an insulator and how does it work

Answer 8

Insulators are poor conductors of heat, so the heat isn’t easily transferred away, so it is kept in the material effectively