Physics
For accurate scientific work, temperatures are often measured by

Thermoelectric thermometers
Mercury thermometers
Alcohol thermometers
Platinum resistance thermometers

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

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

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