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Just about everyone has heard the nightly weather report include the forecaster stating “the barometer is falling” but just what does that really mean?
A barometer measures rising and falling air pressure – a falling barometer means a decrease in air pressure while a rising barometer indicates increasing air pressure.
Air pressure has a very pronounced effect on the weather and, by knowing about barometric pressure, you are able to make certain predictions about the weather.
Gabriel Fahrenheit, a German physicist, created the Fahrenheit temperature scale in 1714. It is a temperature scale based upon water at sea level having a freezing temperature of 32 degrees F and a boiling point of 212 degrees F. This form of temperature measurement is common in the United States.
Celsius is a temperature scale where the freezing point of water at sea level is set at 0 degrees C and has a boiling point of 100 degrees C. This form of measurement is most commonly used in countries which observe the metric system of measurement.
An anemometer is the modern descendent of the weather vane. The anemometer (or wind gauge) measures wind speed and direction. Tiny cups on the anemometer capture the wind and spin round and round. The revolutions-per-minute of the cups determines wind speed. Anemometers also help determine wind chill temperature.