Effects of Humidity  What happens to hair during periods of changing humidity?  How does human hair compare to that of other animals?  How do other materials compare in expansion and contraction?

Introduction:  Humidity has a significant effect on all of us, and on many things around us. A device measuring humidity is called a hygrometer. In 1783, Swiss physicist and geologist, Horace Bénédict de Saussure built the first hygrometer using a human hair to measure humidity. How can human hair be used to make a hygrometer?  I have noticed that some people's hair will get curly in a humid air. Is this the principle behind a hair hygrometer?

Project description: In this project you will study to determine what happens to human hair as humidity changes?  How does human hair compare to that of other animals?  How does human hair compare with other material in expansion and contraction caused by humidity? You must construct a device that can help you measure the changes in the length of hair or other filaments by changes in humidity.

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