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Heat and Temperature
Heat is a form of energy
The hotter a substance, the more kinetic energy it has
In a solid the particles vibrate more, in a liquid they move
about faster and in a a gas they whizz about even faster

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Heat energy will always flow from an area with high
energy to an area of low energy area
The bigger the temperature difference the faster the
Cool objects in warm place take in energy from
Warm objects in cooler surroundings lose energy
Heat and Temperature
Heat is a measure of how much energy is in a substance and is
measured in Joules ( J )
Temperature is the degree of hotness and is measured in
degrees ( °C )
Warm hot objects emit…read more

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An infra ­ red camera can produce a thermo gram to show
hot and cold spots, as different colors
Specific heat capacity
This is a measure of how much heat a substance can hold
When you heat food you have to heat he pan first before
any energy is transferred to the food, this depends on the
specific heat capacity of the pan, which is how much
energy is needed to raise the temperature of 1
kilogramme of the substance by 1°C…read more

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C is the specific latent heat
M is the mass of the object
T is the temperature
Change of State
Energy is required to overcome the forces of attraction
between particles when changing state
The amount of energy is required to change state is called
the specific latent heat and is measured in J / Kg
It is different for all materials
E is the amount of energy needed to change state
M is the mass of the material
L is the specific latent heat…read more

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Example of E = Ml
How much chocolate is needed to malt a 500 g bar of
chocolate, ( the specific latent heat of chocolate is 250,000 J
/ Kg ) ?
E = mL
= 0.…read more

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The line on the graph levels out whilst the chocolate is melting
because the energy is being used to break the attractive forces
between particles…read more


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