1. Water is a liquid under STP condition.
2. Chemical formula H2O.
3. Molecular weight 18.01528 Amu.
4. Boiling point 1000C or 3730 K.
5. Melting Point 00C or 2730 K.
6. Critical Temperature 6740 K.
7. Critical pressure 22.1x10-6 Pa
8. Density 1.1x103 Kg/m3
Water can exists in three form in solid state it is called ice. In liquid state it is called water. In gaseous state it is called steam. The unit of temperature degree Celsius (0C) and now Scientifically using Kelvin are defined in terms of the triple point of water, ie,273.16 K(0.010C) at 611.2 Pa. At this temperature and Pressure actually solid, liquid and gaseous water co- exists.
Thermo Chemistry of Water
Hf0gas = -241.83 KJ/mol
Hf0liquid = -285.83 KJ/mol
Hf0solid = -291.83 KJ/mol
S gas, 1bar = 188.84 J/moleK
S liquid, 1bar = 69.95 J/moleK
S solid, 1bar = 41/J/moleK
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