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That's easy...all you have to do is get dye(any color will do) water, clear straw(any other color will not work) and a glass jarwith a sealing lid .

Then you combined the water and dye together put it in the glass jar, punch a hole through the lid(has to be big enough for the straw and small enough so that air can't seep out)Then you push the straw through the hole ( if there is some extra space in the lid after the straw is in the hole put tape around the seeping part). then block the top of the straw and tape it up the put the themometer in the sun

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12y ago
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Q: How do you make a homemade themometer?
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