What change in weather does a barometer measure?

Answer 1

Air Pressure

A vacuum tube submerged in a mercury pool is called a barometer. The mercury is pushed upward into the vacuum tube by the mass of the air column above it, which is caused by gravity. The mercury rises 29.92 inches in the vacuum tube at average air pressure. Variations in the air column above the mercury alter the force exerted, causing the mercury column to rise less or more.

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Answer 2

Xavier Atkins

A barometer measures changes in atmospheric pressure, indicating shifts in weather conditions.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.