Question

why is air more dense at sea level?​

Answer 1

air will be dense if it is cool and air will be light if it is hot.

as the sea water is cool the nature of air above it will be cool and so it is dense.

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Answer 2

Hey there!

Boyle's law says that the volume of the gas change proportionally at the constant temperature. If air pressure increases at the constant temperature then volume is decreased and density of air is increased. And when we talk about sea level, there is both the things density of air and air pressure is maximum. That's why  air is more dense at sea level.

Hope it helps you!