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Transcript of Weather Instruments
http://www.google.com/search?num=10&hl=en&site=imghp&tbm=isch&source=hp&biw=1024&bih=587&q=weather+instruments&oq=weather+instruments&gs_l=img.3..0l10.195157.202703.0.202922.214.171.124.0.0.0.94.12126.96.36.199.eaqth..0.0...1.1.zlh89n0DqE8 The wind blows these cups, which turns this pole, and then the wind speed is measured. 3. Aneroid Barometer One type of barometer that uses a small metal box which moves when the air pressure changes. 4. Mercury Barometer Another type of barometer that has been replaced by the aneroid barometer because it uses mercury. When the air pressure changes mercury gets pushed into the glass tube. 6. Wind Vane Wind Vanes are used to find the wind direction. The wind blows the "chicken", in this case, on the top and it points the direction the wind is blowing. 5. Hygrometer: Hygrometers are used for measuring the amount of water vapor in the air (the humidity). 7. Rain Gauge Rain gauges collect rain over a certain period of time. The water fills up the tube and it show how much rain has fallen. 2. Thermometers Thermometers are used to tell the temperature of the air. They are usually glass tubes with a liquid such as alcohol or mercury (which are no longer used). You might see these on top of houses and in all sorts of shapes. You might see these in your home and other places too. Thanks for watching!!