Why does the barometer fall before a storm?

Question

I need some help understanding the scientific answer to this. It was asked in relation to our Gases and Stoichiometry unit.

Thanks!

Answer 1

Storms are associated with weather fronts that form around low-pressure areas in the atmosphere. The approach of a low-pressure area is indicated by a falling barometer reading. The barometer measures air pressure.

Answer 2

The moisture that fuels the storms get up into the upper reaches of the atmosphere because the moist (usually warm) are rises. Since the air is rising (not falling on us) there is less pushing down (thus low pressure).

Where air is going up pressure is low, where air is going up moisture is condensing, forming clouds, and gathering electrons that were caught in the rising air. "Thunder Bolts and Lightning".