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Chapter 5: Problem 11

Why is it that if the barometer reading falls in one part of the world, it must rise somewhere else?

Short Answer

Expert verified
The barometer reading changes because of shifts in air masses. When air mass decreases in one region and causes a fall in barometric pressure, it implies that the air mass has increased in another area, leading to a rise in pressure there. This movement upholds the principle of conservation of mass.

Step by step solution

01

Understanding Barometric Pressure

Understand that barometric (atmospheric) pressure refers to the force applied by the atmosphere at a certain location. It's virtually the weight of the column of air that extends from that point straight up to the edge of the atmosphere. The pressure can vary based on factors such as altitude, temperature, and weather conditions.
02

Understanding Pressure Shifts

Apprehend that shifts in barometric pressure are primarily a result of air mass movement. When air masses are heated, they expand and rise, leading to a decrease in pressure in that region. Conversely, once air masses cool down, they contract and sink, which causes an increase in pressure.
03

Applying the Principle of Conservation of Mass

Apply the principle of conservation of mass, which states that matter cannot be created or destroyed; it can only be rearranged. Drawing on this principle, in meteorology, it is understood that the total mass of the earth's atmosphere remains constant. Therefore, if the barometric pressure decreases (i.e., air mass decreases) in one area, this air must increase somewhere else, leading to a rise in barometric pressure in that other area.

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