Heat Energy and Transfer – Flashcards
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the movement of energy from a warmer object to a cooler object is called
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heat transfer
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what are the three types of transfer
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radiation, conduction, and convection
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what is radiation
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the transfer of energy through invisible waves through an empty space
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what are two forms of radiation
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energy from the sun to the earth, or, energy from a flame to a person
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what is conduction
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heat transfer by direct contact of particles of matter
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what is an example of conduction
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a spoon in a mug of hot chocolate, or the ground heating the air above it
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what is convection
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heat transfer by the movement of particles in heated fluids (liquids & gases)
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heat transfer by convection is caused by differences of density due to a difference in?
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temperature
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a measure of the amount of mass there is in a given volume
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density
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what happens to a fluid when its temperature increases
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its density decreases
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if a pot of water is no longer heated, when will the convection currents stop flowing?
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when the water in the pot is the same temperature throughout
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true or false? convection currents flow in the atmosphere
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true
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true or false? convection currents occur mainly in solids
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false- liquids and gases
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what are convection currents and what causes them?
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the flow or transfer or of heat within a fluid (gas & liquid). a difference in density and temperature
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what causes convection currents in earths atmosphere?
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the difference in temperature and density
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true or false? the transfer of energy through empty space is called convection
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false- radiation
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true or false? the movement of energy from a warmer object to a cooler object is called heat transfer
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true
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true or false? conduction is heat transfer by direct contact of particles of matter
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true
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true or false? radiation is the transfer of heat by the movement of heated fluid
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false- convection
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what is an example of convection?
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a hot air balloon rising
