A barometer is used meteorology to measure the pressure exerted by Earth's atmosphere. There are four different units it uses: torr, psi, millibar, pascal. Traditional ones use the mercury and they go by inch of mercury. How it works is: 1. Get a barometer. 2.Place the barometer in a location that is not affected by radical changes. 3. Set the barometer. 4. Watch for the movable hand to increase. 5. Watch for the movable hand to decrease. 6. Create a chart and map out the barometric pressure from day to day.
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