Describe the physical properties of water.

(N/A) Water is a colourless and tasteless liquid. The unusual properties of water in the condensed phase (liquid and solid states) are due to the presence of extensive hydrogen bonding between water molecules.
This leads to high freezing point,high boiling point,high heat of vaporisation,and high heat of fusion in comparison to $H_{2}S$ and $H_{2}Se$.
In comparison to other liquids,water has a higher specific heat,thermal conductivity,surface tension,dipole moment,and dielectric constant.
These properties allow water to play a key role in the biosphere.
It is an excellent solvent for the transportation of ions and molecules required for plant and animal metabolism.
Due to hydrogen bonding with polar molecules,even covalent compounds like alcohol and carbohydrates dissolve in water. Physical properties of $H_{2}O$ and $D_{2}O$ are summarized below:

Property	$H_{2}O$ vs $D_{2}O$
Molecular mass $(g \ mol^{-1})$	$H_{2}O: 18.0151, D_{2}O: 20.0276$
Melting point $(K)$	$H_{2}O: 273.0, D_{2}O: 276.8$
Boiling point $(K)$	$H_{2}O: 373.0, D_{2}O: 374.4$
Enthalpy of formation $(kJ \ mol^{-1})$	$H_{2}O: -285.9, D_{2}O: -294.6$
Enthalpy of vaporisation $(373 \ K)$ $(kJ \ mol^{-1})$	$H_{2}O: 40.66, D_{2}O: 41.61$
Enthalpy of fusion $(kJ \ mol^{-1})$	$H_{2}O: 6.01, D_{2}O: 6.28$
Temp of max. density $(K)$	$H_{2}O: 276.98, D_{2}O: 284.2$
Density $(298 \ K)$ $(g \ cm^{-3})$	$H_{2}O: 1.0000, D_{2}O: 1.1059$
Viscosity (centipoise)	$H_{2}O: 0.8903, D_{2}O: 1.107$
Dielectric constant	$H_{2}O: 78.39, D_{2}O: 78.06$
Electrical conductivity $(293 \ K)$ $(ohm^{-1} \ cm^{-1})$	$H_{2}O: 5.7 \times 10^{-8}, D_{2}O: 3.0 \times 10^{-8}$