At which temperature does liquid water show maximum density ?

The density of water will reach its maximum value at the temperature of –

Why does water boil at a temperature below 100 degree Celsius at higher altitudes?

Maximum temperature inside pressure cooker depends on :

The temperature at which the vapour pressure of a liquid equals the atmospheric pressure is called its:

What changes will the volume of water show if the temperature is lowered from 9° C to 3° C :