Step-by-step explanation:
1) any thing which occupied space
2) because they have less intramolecular space between their atoms
3) no air is not a matter because it don't occupies space
4)a) the phenomenon of changing liquid into water vapours at room temperature is called evaporation
b) the process of changing of liquid into solid is called freezing
5) by process of vaporization and solidification water change its form
6) liquid has less intramolecular force of attraction
it has lower density
it can flow from higher level to lower level
7) H2+O -----------> water