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The particles also have different amounts of energy when the substance is in different states. For example, particles in liquid water have more energy than particles in ice. To change a substance from one state to another, you must add or remove energy.
In any case, the answer to this part of the question is that the change of state between liquid water and gaseous water is caused by the addition of enough energy to the molecules that they are able to escape the binding cohesive forces and enter into the rarefied gas phase. That was the simple answer.