How To Make a Barometer

What is a “Barometer” ?

Answer: An instrument used to measure atmospheric pressure. There are two main types: aneroid and mercury. The aneroid barometer makes us of a small sealed chamber connected to a pointer mechanism. Mercury barometers use a glass tube filled with mercury and inverted over a mercury-filled chamber. Normally, the atmosphere at sea level can support the column of mercury to 29.92 inches. An aneroid barometer is calibrated so that its pointer reads the pressure as inches of mercury, too.

I don’t have lots or mercury (only on my tooth fillings as my dentist said, but is not enough to make one), so I decided to build an “Aneroid Barometer”