Air PressureAir PressureHow to measure the air How to measure the air

around us.around us.

Air pressureAir pressure is the force exerted on you by is the force exerted on you by

the weight of tiny particles of air the weight of tiny particles of air (air molecules). Although air (air molecules). Although air molecules are invisible, they still molecules are invisible, they still have weight and take up space. have weight and take up space. Since there's a lot of "empty" Since there's a lot of "empty" space between air molecules, air space between air molecules, air can be compressed to fit in a can be compressed to fit in a smaller volume.smaller volume.

At sea level, the At sea level, the air pressureair pressure is is about 14.7 pounds per square about 14.7 pounds per square inch.inch.

=1013.2 millibars

=1013.2 Hectopascal=29.92 inches of mercury

Low pressures ~ 950 mb to Low pressures ~ 950 mb to 1005mb.1005mb.

High pressures ~ 1015mb to High pressures ~ 1015mb to 1040 mb1040 mb..

Under a low pressure area, Under a low pressure area, air is air is risingrising and as a result, the and as a result, the surface has less air molecules surface has less air molecules than before. Under a high than before. Under a high pressure area, pressure area, air is sinkingair is sinking towards the surface and piles up towards the surface and piles up before spreading out.before spreading out.

Digital BarometerDigital Barometer

TemperatureTemperature is a measure of the average heat or is a measure of the average heat or

thermal energy of the particles in a thermal energy of the particles in a substance. substance.

Unit of temperatureUnit of temperature Degrees Degrees CelsiusCelsius Degrees Degrees FahrenheitFahrenheit

QuizQuiz1._______2._________Unit of temperature1._______2._________Unit of temperature3._______3._______is the force exerted on you is the force exerted on you

by the weight of tiny particles of air by the weight of tiny particles of air At sea level, the At sea level, the air pressureair pressure is about is about

4.________inhg 5._______millibars4.________inhg 5._______millibars6. _______ pounds per square inch(psi)6. _______ pounds per square inch(psi)7._______ 7._______ is a measure of the average is a measure of the average

heat or thermal energy of the particles heat or thermal energy of the particles in a substancein a substance

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