Measures Atmospheric Pressure or Air pressure.
Atmospheric Pressure At the bottom of a swimming pool, the pressure is equal to the weight of the overlying water divided by the area that weight is pressing against. The same idea applies in the atmosphere. For every square meter of the surface of the Earth, the full weight of all the air above that square meter, extending all the way up to space, is pressing down. This is called atmospheric pressure. Atmospheric pressure is less when you go up a mountain, because the higher you go the less air is above you. This is why air is denser at lower altitudes; the greater pressure squeezes more air molecules into each cubic centimeter.
Measuring Air pressure helps us determine the change in the weather.
If it is going to rain the hand will move the the left.
If it is going to stay the same the hand will not move.
If it is going to be sunny the hand will turn to the right
pressure is the force per unit of air
p=pressure f= force a=air
- diving in a pool
-walking on snow
-pumping a bike tire
-cutting food with the wrong side of the knife
resources:
Mr. Regester's Home page http://academic.greensboroday.org/~regesterj/
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