Physics
A gas thermometer is more sensitive than a liquid thermometer because a gas :

Is lighter than liquid
Expands more than a liquid
Is easy to obtain
Does not change state easily

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is more than the density of river water
The sea is wider than the river
The density of sea water is lesser than the density of river water

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