Heating and cooling yr 8 Flashcards
What is another name for heat energy
Thermal energy
What are the units for measuring heat energy
Joules
Which 3 things determine the amount of heat energy in an object
Mass, temperature, material
How does heat travel through a solid
Conduction
Why are solids better conductors than liquids or gases
The particles are closer together and vibrate in fixed position
Why are feathers good insulators
They contain a lot of air
What happens to particles when they are heated
They move /vibrate faster
What happens to materials when they are heated
They expand
Which type of material can heat travel through by convection
Liquid and gases
How does heat travel through liquid and gasses
Convection
What do all hot objects emit
Radiation
How does heat travel through a vacume
By radiation
Which type of heat transfer does not need particles
Radiation doesn’t need particles
When a fluid expands, what decreases
Density
What happens to the density of a liquid or gas when it cools down
The density increases
