Reports a negative value for the maximum force

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In a surface tension experiment, why does the scale reports a negative value for the maximum force required for the loop to break free? (Using Newton's 3rd Law)

What are two reasons why the measured surface tension for distilled water in a surface tension experiment may differ from the accepted value. State how (increase or decrease) and why the surface tension changes when soap is added?

Reference no: EM132490579

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