Heat Flashcards
(25 cards)
What happens when we heat a solid liquid or gas?
It expands
Heat
Is a form of energy
What happens when we cool solid liquid or gas?
It contracts
Heat is transferred by?
Convection, Conduction, Radiation
Conduction
Heat travels from particle to particle along a substance normally a solid
Convection
Heat travels through a fluid (liquid or 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 vacum
Conductor
Something that allows energy é.g heat to flow through it é.g metal is a good conductor
Insulator
A substance that dosent allow heat to flow through it like plastic
To show that solid expands when heated and contracts when cooled
Ball and ring apparatus
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 war layers of clothes the air between the layers of clothes, air is trapped to keep us warm
Winds are Formed by convection
the sun heats the earth this causes hot air to rise as the hot air rises it cools and then sinks down to ground
Temperature
A measure of how hot an object is
Thermometer
The liquid in a thermometer will expand when heated and rise and will contract and fall when cooled
Boiling point of water
100 degrees
Freezing point of water
0 degrees
Melting point
When a solid turns into a liquid
Boiling point
When a liquid turns into gas
Condensation
Is a gas turning into a liquid
Latent Heat
The heat taken in or given out when a substance is changing state without a change in temperature
Latent heat of vaporisation
Is used when a liquid changes into a gas
Dull, black surfaces absorb
Better then a shiny surface
The amount of water in a substance
Depends on mass and what it is made of é.g. 200ml of water at 60 degrees has twice as much heat at 60 degrees
