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Copy of Conduction, Convection, Radiation

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by

Francine Serrurier

on 14 July 2016

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Transcript of Copy of Conduction, Convection, Radiation

How Matter Gets Heated
Conduction
Convection
Radiation
How does thermal energy move between matter in conduction?
Conduction: flow of thermal energy when objects are in direct contact (touching)
How is conduction useful?
cooking
electrical wires
computers
cell phones
All these work by conduction!
We need good CONDUCTORS.
substance through which energy (thermal, electric) passes easily
What is the handle of this skillet made of?
Materials like wood and plastic are good INSULATORS.
Substances through which energy doesn't move easily.
Insulators
Insulators are very useful!
Why are these electric wires coated in plastic?
What made the paper spiral spin?
Check this cool video out!
Convection happens when a warm liquid or gas moves from one place to another.
What do liquids and gases do when they are warmed?
Warm liquids and gases rise.
Cool liquids and gases sink.
This creates a CURRENT.
Also useful for cooking food!
Heating a house.
Clouds are created by convection.
Hot side.
Cold side.
Both conduction and convection require MATTER to move energy.


Radiation is different.
When you stand near a fire, you feel warm because you are gaining thermal energy. But this energy moves from the fire to you without the use of matter. This is radiation.
There are no particles in space. How does the sun's energy reach us?
Dark materials absorb radiation.
Light materials reflect radiation.
Glass and clear materials allow radiation to pass through.
In the morning, the land absorbs heat quicker than the sea.
The air above warms up, rises and a convection current is set up.

Cooler air comes in off the sea as a ‘sea breeze’.

In the evening, the land cools down quicker than the sea.

The air above the sea is therefore warmer and it rises.

A convection current is set up as this air is replaced by cooler air from the land.

This is a ‘land breeze’.

This is a ‘land breeze’.
Full transcript