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optical contact angle meter to measure surface tension of water using different company's software

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IN this video, we show you difference between drop shape analysis software from various company. we measured redistilled water at temperature 20℃ and used pendant drop method to calculate surface tension of water. Measured result is shown as below:
kino 72.87mN/m (average value from left and right side)
dataphysics 73.26mN/m
Biolin 72mN/m
S.B.Hai 70.18mN/m
Kruss DSA1.92.1 72.99mN/m
Kruss DSA3 73mN/m
 

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