Energy in the form of heat flows
from a warmer to a colder body.
When energy flows away from a
warm object the temperature of
that object decreases
Measuring temperature
A thermogram uses colour to show
temperature: hottest areas are white/yellow,
coldest ares are black/dark/purple/blue
Heat is a measurement of
internal energy. It is measured
on an absolute scale
Specific heat capacity
All substances have a property
called specific heat capacity which is;
the energy needed to raise the
temperature and measured in joules
per kilogram
When an object is
heated and its
temperature rises
energy is transferred
Energy transferred =
mass x specific heat
capacity x temperature
change
Specific latent heat
It is the energy needed to melt or boil
1kg of the material and measured in joule
per kg and differs for different materials
and each of the changes of state
When an object is heated and it
changes state energy is
transferred but the temperature
remains constant