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Weather Instruments

Weather Instruments. Basic Weather Parameters and Instruments Used. 1.Temperature. Thermometer is an instrument for measuring temperature.

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Weather Instruments

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  1. Weather Instruments

  2. Basic Weather Parameters and Instruments Used

  3. 1.Temperature Thermometeris 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.

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

  5. Thermometer Shelter

  6. 2. Atmospheric Pressure 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.

  7. Two types of barometer: Mercurial Barometer Aneroid Barometer

  8. 3. Surface Wind Velocity and Directions Wind vane is an instrument used to indicate wind direction

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

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

  11. SLING-PSYCHOMETER is used to measure relative humidity.

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

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

  14. 4. PRECIPITATION 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.

  15. DRIZZLE

  16. RAIN

  17. SLEET

  18. SNOW

  19. GRAUPEL

  20. HAIL

  21. 5. Clouds are condensed water vapor carried aloft and are either composed of water droplets or ice crystals depending upon their altitude and temperature conditions.

  22. Our Earth Our Future Our Choice Thank You!

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