What hygrometer is made of
Measures air humidity.
- Human hair strand — has part. The length changes with humidity.
- Gauge needle and dial — has part. It shows the humidity.
- Spring — has part. The tension of the hair.
- Wood — is made of. Early hygrometers were a wooden frame with a sensitive fibre or hair.
- Plant fibre — is made of. Humidity was shown by a fibre that changed length.