H2o is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. Gaseous state to liquid state has most likely take place.
In the gaseous state, molecules of water are far away. Hence intermolecular forces are weak.
But when water vapours changes into liquid state molecules start coming closer. And hence intermolecular forces become strong.
Due to this entropy of water molecules decreases.
Thus from above we concluded that when water vapour changes into liquid its molecules is slow down.
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