What instrument is used to measure atmospheric pressure and how is it read on weather maps?

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Multiple Choice

What instrument is used to measure atmospheric pressure and how is it read on weather maps?

A barometer measures atmospheric pressure. On weather maps, surface pressure values are given in hectopascals (hPa) or millibars (mb), with 1 hPa equal to 1 mb, and these values are often reduced to sea level so differences due to elevation don’t mask the true pressure pattern. This sea-level pressure standard lets meteorologists compare pressures across locations and draw isobars—lines that connect points with the same pressure. You’ll also see high and low pressure centers indicated on the map, helping interpret the flow and weather patterns. Humidity, temperature, and wind instruments correspond to other measurements, so they aren’t used for reading pressure on maps in the same way.

A barometer measures atmospheric pressure. On weather maps, surface pressure values are given in hectopascals (hPa) or millibars (mb), with 1 hPa equal to 1 mb, and these values are often reduced to sea level so differences due to elevation don’t mask the true pressure pattern. This sea-level pressure standard lets meteorologists compare pressures across locations and draw isobars—lines that connect points with the same pressure. You’ll also see high and low pressure centers indicated on the map, helping interpret the flow and weather patterns. Humidity, temperature, and wind instruments correspond to other measurements, so they aren’t used for reading pressure on maps in the same way.

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