A phase change occurs when a substance changes from one state of matter to another.
A scene in which at least two phase changes take place is when ice is converted to vapor.
To convert ice to vapor, we need to supply energy to the ice in form of heat. The molecules in the ice begin to move faster as they acquire more energy and eventually the lattice falls apart and ice is converted to liquid.
As more energy is supplied, the molecules acquire even greater energy and move at higher speeds, all the intermolecular bonds between the molecules are severed as the liquid turns into vapor.
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