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Weather Instuments. Thermometer. Thermometers measure air temperatures. Thermometers work because matter expands when heated. Most thermometers are closed glass tubes containing liquids such as alcohol. Do you think you could make a working thermometer?. Barometer.

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Presentation Transcript
slide3
Thermometers measure air temperatures. Thermometers work because matter expands when heated. Most thermometers are closed glass tubes containing liquids such as alcohol.
slide6
A barometer measures air pressure.
  • There are two types of Barometers: Mercury Barometer and Aneroid Barometer.
slide7
A Mercury Barometer consists of a glass tube inserted into a dish of mercury or colored denatured alcohol.
  • *(If you build your own, don’t use mercury)
slide8
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.
slide11
A psychrometer measures the humidity of the air. One of the two thermometers has a wick (cloth cover) which is dipped in distilled water.
slide12
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).
slide14
One such psychrometer is a Sling Psychrometer.
  • Measurements are taken by whirling the psychrometer with the handle.
slide15
See if you can calculate the relative humidity of the class room. How does it compare to the relative humidity outside?
slide17
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?
slide19
If I wanted to find out if the pressure was rising, I’d use which of the following?

Used to determine the relative humidity.

Thermometer

Barometer

Psychrometer

Wind Vane

Rain Gauge

Anemometer

slide20
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.

Thermometer

Barometer

Psychrometer

Wind Vane

Rain Gauge

Anemometer

how did you do here are the correct answers
How did you do? Here are the correct answers

1.Barometer

2. Psychrometer

3. Anemometer

4. Thermometer