99) Mercury is often used in barometer because

it is the best liquid

the height of barometer will be less

its vapour pressure is so low that it may be neglected

both the height of barometer will be less and its vapour pressure is so low that it may be neglected

Answer is:

both the height of barometer will be less and its vapour pressure is so low that it may be neglected

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100) Barometer is used to measure

pressure in pipes, channels etc.

atmospheric pressure

very low pressure

difference of pressure between two points

Answer is:

atmospheric pressure

Explanation:

Atmospheric pressure: The atmospheric air exerts a normal pressure upon all surfaces with which it is in contact and it is known as atmospheric pressure. Atmospheric pressure is also known as barometric pressure. Barometer is used to measure atmospheric pressure.