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Weather Measurement Tools

cynthia-warren avatar
5 diapositives · 204 Views · Oct 25, 2014

Discover key weather measurement tools including thermometers, psychrometers, barometers, and anemometers. Thermometers measure air temperature in degrees Celsius (°C) by observing liquid expansion and contraction. Psychrometers, using dry and wet bulb thermometers, assess humidity levels through evaporation effects. Barometers evaluate atmospheric pressure in hPa (hectoPascals) by using a mercury column. Anemometers track wind speed, typically in kilometers per hour (km/h), based on revolution counts. Understand these instruments to enhance your weather insights!

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Weather Measurement Tools
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  1. Weather Measurement Tools

  2. Thermometer • What? • Measures the air temperature • How? • Heat expands the liquid in the vacuum tube and causes it to “rise”, likewise, cold causes the liquid in the vacuum tube to contract. • Measurement unit: degrees Celsius (°C) • Fun Fact: Thermometers were refined for studying weather, not for any other science.

  3. Psychrometer • What? • Measures humidity in the air – relative humidity • How? • By comparing the temperature of a “dry bulb” thermometer with that of a “wet bulb” thermometer. • When water evaporates from the cloth it absorbs heat and produces a cooling effect on the wet bulb thermometer. • If the humidity is low, more evaporation will occur causing more cooling and a lower temperature on the wet bulb thermometer. If the humidity is high, not much evaporation will take place causing less cooling and not as great of a difference between the wet and dry bulb readings. The wet bulb thermometer will most always have the lower temperature. • Measurement Unit: percent (%)

  4. Barometer . • What? • Measures atmospheric pressure • How? • The drawing shows the basic principles of a barometer. • A glass tube from which the air has been removed is inserted into a dish of mercury. The air pressing down on the mercury in the dish forces some of the mercury up into the glass tube. • Measurement unit: hPa (hectoPascals) or mm www.usatoday.com/weather/wbaromtr.htm http://geography.sierra.cc.ca.us/booth/Physical/chp5_atm_pressure/barometer.gif http://www.ludolph.de/Handel%20Barometer%20262238.jpeg

  5. Anemometer • What? • Measures wind speed • How? • By counting the number of revolutions in a set amount of time. (Calibration required) • Measurement unit: usually kilometers per hour (km/h) http://www.delta-education.com/productdetail.aspx?Collection=N&prodID=2039&menuID=31