Physics-Heat Flashcards
Heat is a
Form of energy
It is measured in
Joules (J)
Heat always moves from a
Hot area to a cold area
Conduction is the
Transfer of heat through a substance without the particles in the substance moving out of position
Metals are very good
Conductors of heat
An insulator is
A substance that does not allow heat to pass through it easily.
Insulators are very poor conductors
Convection is the
Transfer of heat through a liquid or a gas when molecules of the liquid or gas move upwards and carry the heat
Radiation is the
Transfer of heat in rays from a hot object without needing a medium to pass through
What radiates heat better ?
A dull black surface
What doesn’t radiate heat better
A bright shiny surface
Solids liquids and gases all
Expand when heated and contract on cooling
When water is cooled below 4 C
It begins to expand
