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Today, measurements of surface tension are done in a lab environment using costly instruments, making it hard to leverage this property in ubiquitous applications. In contrast, we show how to measure surface tension using only a smartphone. We introduce a new algorithm that uses the small waves on the liquid surface as a series of lenses that focus light and generate a characteristic pattern. We then use the phone camera to capture this pattern and measure the surface tension. Our approach is simple, accurate, and available to anyone with a smartphone. Empirical evaluations show that our mobile app can detect water contamination and measure alcohol concentration. Furthermore, it can track protein concentration in the urine, providing an initial at-home test for proteinuria, a dangerous complication that can lead to kidney failure.<\/jats:p>","DOI":"10.1145\/3481038","type":"journal-article","created":{"date-parts":[[2021,9,22]],"date-time":"2021-09-22T14:37:02Z","timestamp":1632321422000},"page":"75-83","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Liquid testing with your smartphone"],"prefix":"10.1145","volume":"64","author":[{"given":"Shichao","family":"Yue","sequence":"first","affiliation":[{"name":"Massachusetts Institute of Technology, Cambridge, MA"}]},{"given":"Dina","family":"Katabi","sequence":"additional","affiliation":[{"name":"Massachusetts Institute of Technology, Cambridge, MA"}]}],"member":"320","published-online":{"date-parts":[[2021,9,22]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1119\/1.2215617"},{"key":"e_1_2_1_2_1","volume-title":"Applications of Classical Physics","author":"Blandford R.D.","year":"2008","unstructured":"Blandford , R.D. , Thorne , K.S. 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