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Are the measurement results of the bubble pressure tensiometer comparable to the measurement results of the Du Noy method of measurement?

April 26, 2017BUBBLE comparable DU measurement method noy pressure results tensiometer

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Are the measurement results of the bubble pressure tensiometer comparable to the measurement results of the Du Noy method of measurement?

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Actually, no. The Du Noy method of measuring is a static method, whereas the bubble pressure method, owing to the finite bubble lifetimes, is a dynamic method of measuring. The longer the bubble lifetime is the more the measured value of the dynamic method approaches the value of the static method. For that reason, this is also called measuring in the semi-static range. The bubble lifetime at which the semi-static range is reached depends on the surfactant being tested and can go beyond a bubble lifetime of 60s.