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3568453
Heat
Descrição
;)
Sem etiquetas
heat
effects
expansion
Mapa Mental por
canned_rainbows
, atualizado more than 1 year ago
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Criado por
canned_rainbows
mais de 8 anos atrás
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Resumo de Recurso
Heat
Heat transfer
Conduction (contact)
Definition
Flow of heat
High to low temperature
Without movement of matter as awhole
Medium
Solids : Best conductors
Good conductors
E.g. Metals
Poor conductors (Insulators)
Air
Materials that trap air
E.g. foam, feathers
Gases : Worst conductors
Convection
Definition
From high to low level
Flow of heat
Movement of liquids of gases as a whole
Medium
Occurs in liquids and gases
Convection current (flow)
Hot air rises
Expands so the air is less dense
Cold air sinks
Contacts so the air is less dense
Radiation
Definition
Flow of heat
From high to low temperature
By electromagnetic waves
Medium
Solids, liquids and gases
Can pass through a vacuum
Colours
Matte black
Best absorber and emitter
Shiny silver
Worst absorber and emitter
Very good refector
Heat and its effects
Expansion and contraction
Expansion
Object expand and increase in volume
Contraction
Objects contract and decrease in volume
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