Weather and Climate Chapter 1 Section 2. OBJECTIVE: Investigate the properties of air.

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Presentation transcript:

Weather and Climate Chapter 1 Section 2

OBJECTIVE: Investigate the properties of air.

*Because air has mass, it also has other properties, including density and pressure. *Density is the amount of mass in a given volume of air. Density = mass divided by volume Pressure is the force pushing on an area or surface. The weight of the atmosphere exerts a force on surfaces Air Pressure is the result of the weight of a column of air pushing down on an area.

Barometer: an instrument that is used to measure air pressure. Two common kinds of barometers are Mercury Barometers and Aneroid Barometers. Mercury Barometer: consists of a glass tube open at the bottom end and partially filled with Mercury. Aneroid Barometer: Has an airtight metal chamber that is sensitive to changes in air pressure. *Aneroid means “withour liquid”

When altitude (the distance above sea level) increases, air pressure decreases. As air pressure decreases, so does density.