Weather Instuments - PowerPoint PPT Presentation

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Weather Instuments

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Weather Instuments Thermometer Thermometers measure air temperatures. Thermometers work because matter expands when heated. Most thermometers are closed glass tubes ... – PowerPoint PPT presentation

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Title: Weather Instuments


1
Weather Instuments
2
Thermometer
3
  • Thermometers measure air temperatures.
    Thermometers work because matter expands when
    heated. Most thermometers are closed glass tubes
    containing liquids such as alcohol.

4
Barometer
5
  • A barometer measures air pressure.
  • There are two types of Barometers Mercury
    Barometer and Aneroid Barometer.

6
Aneroid Barometer
Mercury Barometer
7
  • A Mercury Barometer consists of a glass tube
    inserted into a dish of mercury or colored
    denatured alcohol.

8
  • The surrounding air presses down on the mercury
    in the dish and forces some of the mercury up
    into the tube. The height to which the mercury
    rises in the tube is directly proportional to the
    atmospheric pressure.

9
Hygrometer
10
  • A hygrometer
  • measures the humidity of the air. One of the two
    thermometers has a wick (cloth cover) which is
    dipped in distilled water.

11
  • Evaporation of water from the wick on the wet
    bulb thermometer leads to cooling.
  • Using a Relative Humidity Table, the temperature
    difference between the two thermometers gives the
    relative humidity of the air (in percent).

12
  • This is an example of the type of table you would
    use. Your book might also have an example.

13
Anemometer
14
  • An Anemometer measures the wind speed. The cups
    catch the winds, turning a dial attached to the
    instrument.
  • Think you could build one of these?

15
WIND VANE
Shows the wind direction
16
Rain Gauge
17
Time for a little review!
Ready?
18
  • Thermometer
  • Barometer
  • Psychrometer
  • Wind Vane
  • Rain Gauge
  • Anemometer
  1. If I wanted to find out if the pressure was
    rising, Id use which of the following?
  2. Used to determine the relative humidity.

19
  • Thermometer
  • Barometer
  • Psychrometer
  • Wind Vane
  • Rain Gauge
  • Anemometer
  • 3. Can help you find out the wind speed.
  • 4. If I wanted to know the difference between the
    temperature inside and outside of the classroom.

20
How did you do? Here are the correct answers
  • 1.Barometer
  • 2. Psychrometer
  • 3. Anemometer
  • 4. Thermometer
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