WATER

Water is formed when Hydrogen chemically combines with Oxgen {H2(g) + O2(g) -> H2O(l)}

Physical properties of Water

At a temperature of 0°C, Water freezes and at 100°C, Water melts
It has a density of 1g/cc at 4°C
On freezing, Water expands and the more it expands , the less its density .Thats why ice floats.

Chemical properties of Water

WATER IN THE ATMOSPHERE

1.Hygroscopy
Hygroscopy is the absorption of water from the atmosphere
Examples of Hygroscopic substances include:*Hygroscopic substances are used as drying agents

2.Deliquescene

Deliquescene is the absorption of water from the atmosphere by a solid and then dissolved in the water
Examples of Deliquscent substances include:*Deliquscent substances are hygroscopic but Hygroscopic substances are not Deliquescent

3.Efflorescence

Efflorescence is the giving up of the water of crystallization from the atmosphere by a crystal.
Examples of Efflorescent substance include:Test for water