Q&A for How to Make a Hygrometer

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Do we have to use horse hair or can I use my own?

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Top Answerer

You can use your own. Horse hair is not essential for this project, as your hair and horse hair both absorb humidity.

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Question

What is the width and length of the wood block?

Community Answer

The width and length are nine inches and four inches, respectively. If you are using longer or shorter materials, this will vary depending on the size change.

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Question

Can I use horse hair instead?

Community Answer

Sure, as long as you clean it. You should rub it with rubbing alcohol, and then rinse it with shampoo.

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Question

Is there one wet gauze and one dry, or are they both wet?

Community Answer

One is wet and one is dry. If they are the same, then there's no point of using two thermometers.

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Question

Can I use soap to clean the hair?

Community Answer

You would be better off using shampoo and conditioner.

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Question

How much cardboard do I need?

Community Answer

Use as much as needed for the back and the front to hold the thermometers and gauze in properly. You can also make an additional triangle of cardboard attached to the back of the larger piece so it can stand up on its own.

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Question

Do the hairs have to be 12 inches long?

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Top Answerer

It needs to be at least 12 inches long. If it is longer, cut the leftovers with a scissor.

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Question

Can I use horse hair when making a hygrometer?

Community Answer

Yes, horse hair absorbs humidity as well as human hair. Just be sure to wash it first.

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Question

Do I have to use cotton gauze, or can I use a cotton ball?

Community Answer

You can use either, because the gauze is basically made out of cotton. I tried it and it works the same.

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Question

Can I use yarn or thread instead of hair when making a hygrometer?

Community Answer

No you can't because the hair expands cause of humidity. If you used thread or yarn, it just wouldn't work.

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