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‘What happens to the size of the sample?’
Having established that there is a huge increase in volume
and that the only substance in the syringe is water in the
gas state, we move directly onto the particle model explanation.
‘Water in the gas state: explaining in terms of particles’
Students may find it difficult to accept that there is not
‘something’ between the particles, so it is important
to emphasise that the particles are the substance, and that
there cannot be anything else in there with them.
It is also important to emphasise that the particles have
more energy in the gas state but have not changed in any
other way. The increase in volume is because the particles
are moving around more, with lots of empty space between
them, but the particles themselves do not get bigger.
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