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IT'S NOT THE HEAT, IT'S THE HUMIDITY

Measure the humidity level with your own hygrometer

Suitable For

Grade 8

Difficulty

3

Time Required

 <2 Days

Supervision

Advised

What’s it about?

The humidity in the air can be explained as the amount of water a volume of air holds, and is expressed as a percentage. The humidity level is hence also an indication of the likelihood of rain occurring and this is measured using a hygrometer. Make your own weather predictions by building your own simple hygrometer in the following science experiment:

Topics covered

Hygrometer, Humidity

What will I need?

  • PENCIL
  • WOOD STAND & CARD
  • STICKY TAPE
  • HUMAN HAIR
  • DRINKING STRAW
  • DRAWING PIN
  • COTTON REEL

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

Every strand of human hair has a similar makeup. The outer part of a hair strand has a layer of flattened cuticle cells that have a scaly appearance and have oils which repel water. Because the hairs will expand and lengthen in response to absorbed moisture, the length of the hair can be used to measure the humidity of the air with the device built in this experiment. The most basic step in using this ‘hair hygrometer’, is to mark off the reference points from the 0 and 100 percent humidity marks. The space between these measurements can then be subdivided. For example, four marks between the 0 and 100 percent measurements could then be used as approximations of 20, 40, 60, and 80 percent humidity.

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