Heat Transfer

What are the 3 ways heat can be transferred?

Materials that are poor conductors of heat and that can sometimes block heat transfer are called insulators.

As air is [blank_start]heated[blank_end], its particles gain energy and move [blank_start]further[blank_end] apart, becoming [blank_start]less[blank_end] dense. This hot air is less dense than cool air and so it is pushed [blank_start]upwards[blank_end] by the cooler air around it.

Mark the correct boxes that show examples of conduction.

Substances that transfer heat easily are known as conductors.

Convection currents occur in

Radiation transmits heat as [blank_start]invisible[blank_end] waves that travel at the speed of [blank_start]light[blank_end]. Heat travels through empty space between the Earth and the Sun. Heat from the sun cannot be transferred by [blank_start]conduction[blank_end] or convection because there are no [blank_start]particles[blank_end] to vibrate or flow in the vacuum of space.

What happens to heat energy when it hits a surface?

[blank_start]Dark[blank_end] coloured objects heat up more [blank_start]quickly[blank_end] in sunlight than lighter coloured objects. This is because they are good [blank_start]absorbers[blank_end] of radiation, whereas lighter objects [blank_start]reflect[blank_end] most of the heat and don't heat up as quickly.

Temperature tells us how hot or cold something is.

Heat is.....