ENVIRSC 1A03 Chapter Notes - Chapter 4: Pointing Device, Barometer, Grater

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Any instrument that measures pressure is a baramoter. There are two types of barometers most common for routine one has mercry and other uses collapsible chambers. The standard for measuring pressure is mercyry barmother. The air pushes downrard on the pool of mercry and forces some of it up into the tube. The grater the air pressure, the higher the column of mercry. Barometric pressure often expressed as the height of the column of mercry in a barometer , which at sea level averages 76 cm. This measure is inconsistent with the conept of pressure, hwoever, because pressure desont have units of length. Mercr=ury is heavy , witha desnit y of 13. 6 times. One of the important tools is a weather map, which along other things pltos the distribution of air pressure across the surface. 3 correctiosn must be made on the map. Similarity between a mercury barometer and a thermomether.

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