Weather Unit Comments
Lesson: Evaporation
User: Tina Lively [tlively@ciaccess.com]
Subject: Human Hair Humidity Detector
Date: Tue Jun 30 09:22:44 CDT 199
Comments: One may make a humidity detector using a shoe box, a straw, a pin
a human hair and some tape.
1, Take a long blond human hair,wash it in deturgent and dry it
in the air.
2, tape one end to the top of a shoe box.
3, cut a drinking straw to about 2 inches long with 1 end pointed
and tape the pointy end together.
4, tape the other end of the hair to the middle of the straw.
5, pin the straw to the box so that the point of the straw is
pointing slightly above the horizontal.
6, place the box in a room with lots of steam, ie bathroom with the shower
running or next to a boiling kettle.
7, mark where the straw points (100% humidity).
8, dry the hair out using a hair drier.
9, mark where the straw points (0% humidity)
10, check where the straw points each morning to predict relative humidity.
pointing slightly above the horizontal
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