humidity sensor

A less widely used sensor that nevertheless shows interesting results when monitoring environments over time. Place one in a polythene bag with your hand, or a plant and see how the humidity changes. The range of the sensor varies between manufacturer, and it is within the range 10-90% humidity. Acetone and organic solvent vapours are harmful to the sensor while wetting with water leads to unreliable readings.

Possible uses:

  • rate of transpiration and humidity
  • moisture in exhaled air
  • hygrometry
  • weather station
  • moisture from burning fuels
  • moisture uptake through fabrics

I’ve rated these sensors but your assessment will be different. I give a score, out of five, for the sensor’s intrigue, interest, and learning potential. I also give a score for how often a science department might use it.

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