Physics
Pycnometer is an instrument used to measure the

Density
Intensity of earthquake
High temperatures
Intensity of solar radiation

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Physics
The term ''equinox' means

The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The axis of the Earth around which it rotates
When the day and night are of equal duration
The path which the Earthtakes around the Sun

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