A test-tube contains $1.0c{m^3}$ of liquid water at 100 °C. The liquid water boils to form $1600c{m^3}$ of steam.
What is the reason for the large increase in volume?
1 )
Steam molecules are bigger than water molecules.
The average distance between the molecules is much greater in the steam.
3 )
The molecules do not move until the water turns into a gas.
4 )
There are more steam molecules than there were water molecules.
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