
Concept explainers
Interpretation :
The change in the mercury level in a barometer needs to be explained when a high pressure system moves into a region.
Concept Introduction :
Mercury level of barometer indicates the atmospheric pressure of a region.

Answer to Problem 7E
The mercury level in a barometer increases when a high pressure system moves into a region.
Explanation of Solution
Standard pressure is 1 atm. It is equal to the pressure of 76 cm mercury column.
Now, if a high pressure system moves into a region then the pressure increase will be indicated by the barometer. High pressure needs higher mercury level. So the mercury level in barometer will increase.
Mercury level will increase when a high pressure system moves into a region.
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