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Measuring weather with simple tools

DIY dry-wet bulb thermometer and rain gauge experiments

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Measuring weather with simple tools
Dry-wet bulb thermometer and rain gauge
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Measuring weather with simple tools
Dry-wet bulb thermometer and rain gauge
Measuring weather with simple tools1 / 12
Dry and wet bulb thermometer
Section summary or transition context...
Measuring weather with simple tools2 / 12
Objective
Slide subtitle or context (optional)...
  • ●
    Measure air temperature and relative humidity
  • ●
    Compare dry bulb and wet bulb readings
  • ●
    Calculate humidity using a psychrometric chart
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Materials and procedure
Slide subtitle or context (optional)...
  • ●
    Two identical thermometers
  • ●
    Cotton cloth or wick
  • ●
    Water container
  • ●
    Psychrometric chart
  • ●
    Keep one thermometer dry
  • ●
    Wrap wet cloth around second bulb
  • ●
    Keep cloth moist with water
  • ●
    Record both readings simultaneously
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Setup diagram
Slide subtitle or context (optional)...
Side-by-side thermometers with one bulb wrapped in wet cloth and a small water reservoir
Side-by-side thermometers with one bulb wrapped in wet cloth and a small water reservoir
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Observation table
Slide subtitle or context (optional)...
  • ●
    Time of day
  • ●
    Dry bulb temperature in °C
  • ●
    Wet bulb temperature in °C
  • ●
    Calculated relative humidity in %
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Rain gauge
Section summary or transition context...
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Objective
Slide subtitle or context (optional)...
  • ●
    Collect and measure liquid precipitation
  • ●
    Record rainfall depth over time
  • ●
    Compare daily and weekly totals
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Materials and procedure
Slide subtitle or context (optional)...
  • ●
    Clear plastic bottle
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    Ruler and permanent marker
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    Scissors or craft knife
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    Tape or glue
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    Cut the top off the bottle
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    Invert top to form a funnel
  • ●
    Mark measurement scale on side
  • ●
    Place in open area away from trees
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Assembly diagram
Slide subtitle or context (optional)...
Plastic bottle with top cut and inverted into the base, measurement markings on the side, placed on flat ground
Plastic bottle with top cut and inverted into the base, measurement markings on the side, placed on flat ground
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Observation table
Slide subtitle or context (optional)...
  • ●
    Date
  • ●
    Time of collection
  • ●
    Rainfall depth in mm
  • ●
    Weather conditions
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Conclusion
Questions & discussion, contact email or link...

Built two low-cost meteorological instruments • Collected temperature, humidity, and rainfall data • Data can be compared with local weather reports

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