Final answer:
A barometer is a device that measures atmospheric pressure, and it can be used to predict weather and determine altitude. The units of pressure commonly used include millibars, millimeters and inches of mercury, and torr. Isobars are lines that connect points of equal atmospheric pressure and are used to analyze and predict weather patterns.
Step-by-step explanation:
A barometer is a device that measures atmospheric pressure. It can be used to predict weather and also as an altimeter to determine altitude. One common type of barometer is the mercury barometer, which measures atmospheric pressure by the height of a column of mercury. Another type is the aneroid barometer, which measures pressure using the expansion and contraction of a small spring within an evacuated metal capsule.
A millibar is a unit of pressure commonly used by meteorologists. The average atmospheric pressure at sea level is approximately 1013 millibars or 1 atmosphere. Other units of pressure include millimeters and inches of mercury, as well as the torr, which is equal to a pressure of 1 mm Hg.
An isobar is a line on a weather map that connects points of equal atmospheric pressure. Isobars are used to analyze and predict weather patterns, with closely spaced isobars indicating strong winds and large pressure gradients.