a: aneroid barometer ~
b: vacuum


"We live in a large pool of air called an atmosphere. Air pressure is the weight of all this air weighing down on us. A barometer is an instrument that measures the amount of air pressure in the air. An aneroid barometer is like a vacuum and it does not use mercury because it dangerous. The more air that is above us the higher the air pressure is."

Writer: Jamal W.
Where: Reference Link Has Evaporated
Date: Dec 18 2014 11:50 AM

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