Explain why does the mercury level in a barometer go down when atmospheric pressure decreases?

Explain why does the mercury level in a barometer go down when atmosph

1.	Explain why does the mercury level in a barometer go down when atmospheric pressure decreases?
Answer» Solution :The weight of the COLUMN of mercury in the barometer is exactly BALANCED by the atmospheric pressure. THEREFORE, a DECREASE in the atmospheric pressure decreases the LEVEL of mercury to such an extent that the weight of the column of mercury is again equal to the changed atmospheric pressure.