The surface tension of a fluid can be measured with a sliding wire loop, as show
ID: 1525044 • Letter: T
Question
The surface tension of a fluid can be measured with a sliding wire loop, as shown in the figure at right. The device is coated with the fluid to form a thin film, and then the force required to hold the slider in place is measured. What fluid is in the device if the required applied force is 0.00355 N and the length of the sliding wire is 4.72 cm? Find the most likely match for the fluid, using the values in the table given.
The answer is NOT Glycerin of Olive Oil
Liquid Surface Tension [N/m] alcohol 0.0223 olive oil 0.0320 soapy water 0.0370 blood 0.0580 glycerin 0.0631 water 0.0728Explanation / Answer
Expression T.S. is to spread the force over the entire length of contact
T = F/2L
T = 0.00355N / 2 * 0.0472m
= 0.0376 N/m
The most likely match for the fluid
soapy water (0.0370 N/m)
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