Measuring surface tension using a tensiometer.
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Previously:
https://www.homemadetools.net/forum/...053#post168431
https://www.homemadetools.net/forum/...743#post159676
https://www.homemadetools.net/forum/...894#post160120
https://www.homemadetools.net/forum/...990#post164491
https://www.homemadetools.net/forum/...777#post167394
https://www.homemadetools.net/forum/...803#post152335
