Heat Flashcards
(30 cards)
Heat
Form of energy
Solids liquids and gases expand
When heated
Solids liquids and gases contract
When cooled
Bimetallic strip
The different metals will expand and contract ta different rates due to their different molecular preperties
Waters
Begins to expand when cooled below 4 degrees
Conduction
Heat travels from particle to particle along a substance normally a solid
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 to flow through it
Insulated
Is a substance that doesn’t allow heat to flow through it
Reducing pressure
Lowers the boiling water below 100° c
Increasing pressure
Raises boiling point of water above 100° c
Temperature
Is the measure of the hotness of a body and the unit is the degree Celsius
When heat causes a change in state and not a change in temperature we call it
Latent heat
When heat changes a solid to a liquid with no temperature we call it
Latent heat of fusion
When heat changes a liquid to a gas without changing in temperature we call it
Latent heat of vaporisation
Heat can travel by three methods
Conduction, convection and radiation
Insulators are
Materials that are poor conductors of heat
Radiation
The transfer of heat from a hot object without the need of a medium. The sun transfers its energy by radiation
Temperature
A measure how hot an object it
Temperature is measured
With a thermometer
We deal with 2 types of thermometer
Mercury thermometer and alcohol thermometer
The liquid in the thermometer will
Expand and rise when heated and will contract and fall when cooled
Temperature is messured
Between o and 100°c
