Heat Flashcards
Solids, liquids and gases expand
When heated
Solids, liquids and gases contract
When cooled
The unit of energy is the
Joule
Heat
Is a form of energy
Water
Begins to expand below 4 degrees Celsius
Bimetallic strip
Shows that not all metals expand at the same rate.
Conduction
Heat travels from a particle to particle along a substance, normally a solid.
Convection
Heat travels through a fluid(liquid or gas) when particles move and carry heat.
Radiation
Heat travels from a hot object no need for a medium,does not need a solid liquid or gas to go through,will flow through a vacuum
Conduction
Is a method by which heat travels from particle to particle through a solid
Conductor
Something that allows energy e.g heat to flow through it e.g metals
Insulator
Is a substance that doesn’t allow heat to flow through it easily e.g plastic
Air
Is ahold 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 cloths,air is trapped to keep us warm
Melting point
Is when a solid turns to a liquid
Boiling point
Is when a liquid turns to a gas
Freezing point
Is when liquid turns to a solid
Condensation
Is a gas turning to a liquid
Latent heat
The heat taken in or given out when a substance is changing state without a change in temperature
Listen heat of fusion
Is used when a solid changes into a liquid
Later heat of vaporisation
Is used when liquid changes to a gas
Radiation can
A dull black surface radiates heat better than a shiny silver surface.
