Which term is used to describe the effect of changes in pressure over time?

The term that describes the effect of changes in pressure over time is "pressure tendency." This term specifically refers to the trend observed in atmospheric pressure measurements, indicating whether the pressure is rising, falling, or remaining steady over a certain period. Understanding pressure tendency is crucial for meteorologists, as it helps to predict upcoming weather changes. For instance, a rising pressure tendency typically suggests improving weather conditions, while a falling tendency can indicate that a storm or adverse weather is likely approaching.

The other options, although related to pressure, do not specifically capture the dynamic aspect of change over time. For example, "weather pattern" refers to general climate or meteorological conditions rather than specific pressure changes. "Pressure change" describes a shift in pressure values but lacks the temporal component that "tendency" provides. Similarly, "pressure fluctuation" implies a variation in pressure levels but does not convey the sustained trend over time that is inherent in pressure tendency. Thus, "pressure tendency" is the most accurate term for the described phenomenon.