What are millibars and why are they used to measure hurricanes?

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And why is a rapid DROP in them bad?

In: Planetary Science

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Millibar is a way to measure pressure.
Air is a fluid so it behaves like a liquid in a lot of ways. If pressure drops it’s like having a hole in the water of a pool. The rest of the water will fall into that hole. So if pressure drops the storm is going to intensify as air gets less stable.

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