A runny nose. Constant clear and watery nasal discharge from the nose is usually the first complaint. If allergies are the cause of the runny nose then itchiness of the nose and eyes will also be present. A runny nose also commonly results in a stuffy congested feeling in the nose.
by Guest Writer Jenni Worboys. A barometer is a widely used weather instrument that measures atmospheric pressure (also known as air pressure or barometric pressure) - the weight of the air in the atmosphere.
1 Air pressure is the weight of the atmosphere pressing down on the earth. 2  It is measured by a barometer in units called millibars. 3  Most barometers use mercury in a glass column, like a thermometer, to measure the change in air pressure. Most barometers use mercury in a glass column, like a thermometer, to measure the change in air pressure. 2  When the weather is calm the mercury in the barometer seldom moves more than half-an-inch below the 30-inch mark.