a: aneroid barometer ~
b: vacuum
What:
"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."
Useful?
Writer: Jamal W.
LCC:
Where: Reference Link Has Evaporated
Date: Dec 18 2014 11:50 AM
# 6830 Critique Analogy