What does an isobar represent on a meteorological chart?

An isobar is a line drawn on a meteorological chart that connects points of equal atmospheric pressure at a given time. This means that option C, which states it is a line joining places of equal sea level pressure, is correct. By understanding isobars, meteorologists can identify areas of high and low pressure. High-pressure areas typically indicate fair weather, while low-pressure areas are often associated with stormy weather conditions.

The representation of pressure with isobars is crucial for forecasting weather patterns, as the spacing of these lines indicates the strength of the pressure system. Closely spaced isobars suggest strong winds, while widely spaced lines indicate lighter winds. Understanding this concept is essential for interpreting weather charts and predicting atmospheric conditions.