The working principle of barometer?

Barometer of the principle that the height of the barometer inside mercury is supported by atmospheric pressure, that is, how large is the atmospheric pressure, the liquid level of mercury will have much higher, so the barometer, the mercury is higher, the greater the pressure. There are two kinds of barometer: mercury barometer and aneroid barometer. Small make up to introduce today's two inside a: aneroid aneroid barometer: a kind of barometer, is one of the most common metal box barometer. It is a main part of the vacuum metal on the surface of the corrugated box. In order not to make the metal box was squashed by atmospheric pressure, the elastic steel plate made to pull it. Atmospheric pressure increases, lifted the lid dents; Atmospheric pressure decreases, and the elastic pull the lid up some of the steel. Lifted the lid of the changes through the drive mechanism to the pointer, the pointer deflection. The reading on the dial, from beneath the pointer to know when the atmospheric pressure value. Here are aneroid BR300 product specifications and use field use areas: Marine, meteorological and other specifications description: models: BR300 installation: wall materials: plastic shell pointer: black pointer, with golden needle set table: PC table size: 72 mm temperature range: 27. 5/31. 5. '' hg 940/1060 mbar accuracy: + / - 3. 5 mbar packing: 1 PC/white box