Vidhya posts a question:Mercury is costly.So, instead of mercry can we use water as a barometric liquid? Answer to Vidhya and explain, the difficulty of constructing a water barometer.

Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?

Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?

Why don't we use water instead of mercury in Torricelli experiment? If we are ready to do this experiment, what length of tube is needed?

If water be used to construct a barometer, what would be the height of water column at a standard atmospheric presure (76cm of mercury)?

Water is a universal slvent. But alcohol also dissolves most of the substances soluble in water and also many more. Boiling point of water is 100^(@)C and that of alcohol is 80^(@)C. The specific heat of water is much higher than the specific heat of alcohol. (a) List out three possible differences if instead of water as teh liquid in our body we had alcohol. (b) What value can you derive from this special property of water and its innumerable uses in sustaining life on earth ?