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P1a: Heating houses
- Energy Flow
- Energy, in the form of heat, flows from a warmer
body to a colder body.
- When the temperature flows away
from a warm object, the temperature
of that object decreases
- Energy, in the form of heat, flows from a warmer
body to a colder body.
- Measuring Temperature
- A thermogram uses colour to
show temperature
- Temperature is a measure of
hotness on an arbitrary scale
- You do not need a thermometer
- It allows on object to be compared to another
- You do not need a thermometer
- When the temperature of a body
increases, the kinetic energy
increases.
- Heat is a measurement of internal energy
- A thermogram uses colour to
show temperature
- Specific Heat Capacity
- All substances have a property called Specific Heat
Capacity which is:
- -the energy
needed to
raise the
temperature
of 1kg by 1
degrees
celsius
- - measured in joules
per kilogram degrees
celsius and differs for
different material
- -the energy
needed to
raise the
temperature
of 1kg by 1
degrees
celsius
- energy transfered= mass × specific heat
capacity × temperature change
- All substances have a property called Specific Heat
Capacity which is:
- Specific Latent Heat
- - the energy needed to melt or boil 1kg of the material
- measured in joule per kilogram and differs
for different materials and each of the states
- When an object is heated and it
changes state , energy is transfered
but the temperature stays the same
- energy transfered = mass × specific latent heat
- When a substance changes states , energy
is needed to break the bonds that hold the
molecules together
- This is why there is no temperature change
- This is why there is no temperature change
- - the energy needed to melt or boil 1kg of the material
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