solid, liquid and gas *heat needed to change the water's physical state from a liquid to gas (vapor) is the heat of vaporization.
(solid, liquid and gas *heat; needed; to change the water's physical state from a liquid to gas) (solid, liquid and gas *heat needed; is; the heat of vaporization)
solid, liquid and gas *heat solid, liquid and gas *heat needed
needed is
to change the water's physical state from a liquid to gas
the heat of vaporization