Heat Flashcards
Heat
Is a form of energy
Bimetallic strip
It shows that not all metals expand at the same rate, change e.g. Thermostats in heating or an iron
Solid liquids and gases expand
When heated
Solids and gases contract
When cooled
The unit of energy
Joule (j)
Conduction
Heat travels from particle to particle along a substance, normally a solid.
Water
Water begins to expand when cooled below 4 degrees Celsius.
Convection
Heat travels through a fluid( liquid or a gas) when the particles , move and carry the heat.
Radiation
Heat travels from a hot object without the need for a medium, does not need a solid, liquid or gas to go through, will flow through a vacuum
Conductor
Something that allows energy e.g. Heat to flow through it. E.g Metal is a good conductor.
Insulator
Is a substance that doesn’t allow heat to flow through it easily e.g. Plastic.
Air
Is a good insulator, keeps animals warm, is trapped by the fur and helps to insulate the Animal
Layers
The hairs on our arms are not very good at keeping us warm, if we wear layers of clothes, air is trapped to keep us warm
Temperature
A measure how hot an object is.
Temperature is measured:
With a thermometer
