A barometer measures atmospheric pressure. The two most common types of barometers either use a liquid or a spring as the primary mechanism. The basic liquid types look like this: Air pushes the liquid (usually water or liquid mercury) in the bottom up into the tube if the air pressure is high. read more
There is also a third type used in small devices (such as small home weather stations or altimeters), which belong to a type of machine known as microelectromechanical systems. These are not mechanical devices, but use the properties of physics that exist at very small scales. read more
A device used to display atmospheric pressure is a barometer , or you can use an evacuated cell type of gauge. read more
A device used to display atmospheric pressure is a barometer, or you can use an evacuated cell type of gauge. read more