Cheap easy essay topics: Mercury Barometer.
Barometer, device used to measure atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude. There are two main types of barometers: mercury and aneroid. Learn more about barometers in this article.A classic mercury barometer is constructed from a 3-foot glass tube that is open at one end and sealed at the opposite end. The glass tube is filled with liquid mercury and rests upside-down in a reservoir of mercury. As the mercury moves down the glass tube, a vacuum is created. When the atmospheric pressure above the reservoir increases, the.If the vertical height is below the atmospheric pressure (h cm), a metallic click should be heard and the tube filled with mercury. If not, the barometer is faulty. 4. Dampness of mercury: If the mercury is damp, a little water will evaporate into the vacuum. The water vapor formed would exert a pressure in the mercury causing its level to fail.
Another common variety of barometer is a mercury barometer. The aneroid barometer is superior in some ways to this. Mercury is poisonous, so a mercury barometer requires special handling. An aneroid barometer has the added advantages of being smaller and lighter and easier to move safely. This means that one can be carried in a car or on a ship.An antique mercury barometer will have a measured column of mercury in weight in a glass tube with a sealed top and is used to balance against the atmosphere pressing on an exposed cistern of mercury at the base of the column. This will vary due to atmosperic pressure.
A large selection of Antique barometers from mercury wheel barometers, antique stick barometers and aneroid ones. All Antique barometers are carefully overhauled,tested and calibrated, barographs also stocked. WE PERSONALLY DELIVER EACH BAROMETER - PLEASE CONTACT FOR A QUOTE.
