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Thermometer is an instrument for measuring temperature. Mercury is the liquid used in the maximum thermometer which has a narrowed passage called a constriction in the bow of the glass tube just above the bulb. A minimum thermometer contains a liquid of low density like alcohol.

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The thermograph is an instrument that records air temperature on graph paper.

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Thermometer Shelter

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The atmospheric pressure on a given surface is the force exerted per unit area by overlying column of air extending to the outer limit of the atmosphere. Barometer is an instrument for measuring atmospheric pressure.

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Two types of barometer: Mercurial BarometerAneroid Barometer

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Wind vane is an instrument used to indicate wind direction

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Anemometer measures the wind speed and is normally made of cups which are rotated by the motion of the wind.

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Aerovane indicates both the wind direction and wind speed or simply the wind velocity in a remote wind indicator panel.

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is used to measure relative humidity. SLING-PSYCHOMETER

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is a hygrometer and thermograph combination and records both relative humidity and temperature on a graph paper. Hygrothermograph

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Hygrometer is an instrument used to measure the moisture content of a gas, as in determining the relative humidity of air.

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is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation include drizzle, rain, sleet, snow, graupel and hail. It occurs when a local portion of the atmosphere becomes saturated with water vapour and the water condenses.

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Local Action: Does It Make a Difference? Never doubt that a small group of thoughtful, committed citizens can change the world; indeed its the only thing that ever has. Margaret Mead.

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Thank You!