Question

will fan !! ( if u can tell me how to medal, ill do that too )
wool yarn can be substituted for the human hair in a hygrometer. why would this work?

Answer 1

same properties to react to humidity as hair

Answer 2

once treated that is

Answer 3

right side of answer there is a yellow medal on blue ribbon just click that

Answer 4

thank you @mazmaz1 !!