Transferring energy

Question 0

Thermal radiation can be reduced by

Answer 0

Using shiny surfaces to reflect the infrared waves

Question 1

Thermal radiation

Answer 1

Transfer of heat energy in the form of infra red waves

Question 2

Convection

Answer 2

When a gas or liquid is heated it expands
Density decreases
Warmer fluids float upwards as they are pushed out of the way by denser ones.
Energy transferred through kinetic energy

Question 3

Reducing convection

Answer 3

Using a vacuum (convection needs gases or liquids)

Using a lid, the liquid takes longer to cool

Question 4

Conduction

Answer 4

A increase in temperature= increase in average movement energy of molecules

Question 5

How conduction works

Answer 5

The vibrational energy is transferred from molecule to molecule along the material through collisions

Question 6

Why is conduction faster in metals

Answer 6

Because of the free moving electrons in metals

Question 7

Reducing conduction

Answer 7

Using a vacuum/air/water

Question 8

Insulation

Answer 8

Trapping air or water around something so that it cannot circulate
Due to them being poor conductors

Fibre glass insulation, foam, wetsuits, wool, feathers, fur

Question 9

How to keep heat

Answer 9

Shiny surfaces don’t radiate as much heat as Matt black ones