Download - Temperature and Heat Energy
7/23/2019 Temperature and Heat Energy
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Temperature and Heat
Energy
7/23/2019 Temperature and Heat Energy
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gy
How are temperature and
heat energy different? The liquids in these 2 beakers are at the same
temperature, so the particles have the same
average speed
! litre 2 litres
" #
2 #eakers of water
at $%&' are at the
same temperature but
if one is twice as bigas the other, it will
contain twice as much
heat energy as the
other
$%&'
7/23/2019 Temperature and Heat Energy
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To heat both liquids by the
same amount, the liquid in
beaker # must be giventwice as much energy as
the liquid in beaker "
This increases the average speed of theparticles in each liquid by the same amount
Energy is measuredin (oules )*+! litre 2 litres
" #
armer
-2,%%%* .-%%%*
7/23/2019 Temperature and Heat Energy
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hich will contain more
heat energy?
! litre 2 litres
" #
$%&'
"nswer / #
7/23/2019 Temperature and Heat Energy
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hich will contain more
heat energy
! litre
"
! litre
#
02&' !2&'
"nswer / "
7/23/2019 Temperature and Heat Energy
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hat happens when we
mi1 hot and cold? f we mi1 together 2 beakers with the same
volume of water at different temperatures,
the mi1ture will be at an average of the 2
temperatures
! % & '
2 % & '
!$&'
!% 3 2% 4 !$&'
2
7/23/2019 Temperature and Heat Energy
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How much heat is needed?
How much the temperature of
a material is changed by heat
energy depends on 5
! hat the material is
2 How much of it there is
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How much of it there is
Twice as much water needs twice as
much energy to raise its
temperature by the same amount
f it takes -%%%* of energy to warm
up !%%ml of water by !%&', it willtake .%%%* to warm up 2%%ml of
water by !%&'
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hat the material is
To warm up !kg of water by !&',
it takes -2%%* of energy
To warm up !kg of aluminium by
!&', it takes ..%* of energy
t takes more energy to get the
water particles vibrating fasterbecause they are further apart