What Is a Barometer
The mercury barometer works by balancing the weight of the mercury against the atmospheric pressure (or weight of the air). If the mercury is lighter than the air pressure the mercury level will rise in the barometer. If the mercury is heavier than the air pressure the mercury will fall in the barometer. Mercury Barometers: Mercury barometers consist of a glass tube that is sealed at one end and open at the other. This tube is filled with mercury and sits upside down in a reservoir which holds more mercury. If the mercury falls this is an indication of low atmospheric pressure usually signaling a change to wet, windy weather. There are three main types of barometers, mercury barometers, water-based barometers and aneroid barometers. A barometer measures the change in pressure in the atmosphere which occurs when the weather pattern changes....




It features a thermometer, a barometer, a camera eye, a satellite feed, solar panels for energy, and probes that can cut through rock and ice and scoop up samples. “It is unbelievably impressive,” said Griffin principal-superintendent Greg Woods.
More sun, southeast breeze at 10-15, slowly falling barometer. Highs: 68-75 Sunday: dry with more sun, highs rebound into the 70s. T-storms: possible by Tuesday/Wednesday of next week as high temperatures climb to near 80. Dry Weekend.