measuring weather instruments

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  • Measuring Weather
    • Stevenson Screen
      • contains various weather instruments
      • shields meteorological instruments  against precipitation and direct heat radiation
    • Thermometer
      • measures temperature
      • inside the thermometer is a liquid called mercury, when this comes into contact with something warm its particles gain kinetic energy, causing the substance to expand
        • the opposite happens in cold temperatures
      • the unit is °C or  °F
    • Rain Gauge
      • measures precipitation
      • consists of a funnel that transports water in a graduated cylinder, both are made out of glass or plastic with markings on them to show water accumulation
      • measured in mm/"/cm
    • Anemometer
      • measures wind speed
      • there are rwo cups that are open to the wind. the wind catches the cup and causes then to spin. the amount of times the cups rotate completely is the wind speed
      • measured in miles per hour
    • A wind vane
      • measures wind direction
      • has an arrow that moves freely on a pole, the wind will blow it in an appropriate direction; reading the marking north, east, south and west
      • North, south, east, west
    • Barometer
      • measures air pressure
      • measured in milibars
      • Aneroid Barometer most frequently used
        • Air is partially removed from inside the container, and the top, or diaphragm, flexes with each change of atmospheric pressure.
        • Delicate levers transmit these movements to a pointer that moves over a graduated scale.
          • this is connected to a dial so it can be easily seen
    • visibility sensor
      • measures in miles
      • contains a transmitter and a receiver
        • the transmitter sends a laser beam towards the receiver through the open air
        • the proportion of the beam that reached the receiver indicates the visibility
    • hygrometers
      • measures humidity
      • contains two bulbs, each with  thermometer
        • one bulb is covered with a cloth that has been dipped into water the other has nothing done to it
          • as the water evaporates the bulb cools producing a difference in temperatures on the thermometer
        • the amount of evaporation/ cooling depends on the relative humility of the air
      • measured in percentage


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