Surface tension calculation problem

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Homework Help Overview

The original poster seeks to calculate the surface tension of jelly, referencing a textbook definition of surface tension as Y=F/L. There is a focus on understanding how to apply this equation in the context of the problem.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss a method involving a microscope slide and a weighting spring to measure the force due to surface tension. There are questions about the specifics of the measurement process and the interpretation of the length used in the equation.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the measurement setup and clarifying the relationship between the force measured and the dimensions involved in the calculation of surface tension.

Contextual Notes

There is a focus on the definition of surface tension and how it applies to the specific scenario of measuring it in jelly. Participants are questioning the assumptions about the setup and the measurements being taken.

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Homework Statement


I need to calculate the surface tension of jelly (gelatine dessert) or jell-o, as it is known in the states.

My textbook defines surface tension as Y=F/L. Is this the equation I would use to calculate surface tension? If so, how?
 
Last edited:
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Take a microscope slide. Attach it to a weighting spring. Dip it in the jelly. Now try to pull it out carefully. Reading in the spring will start increasing. Note down the reading at the moment when the slide detaches from the jelly. Since there are two surfaces on the slide, length of the free surface of the jelly is equal to the double the length of the slide. So according to the definition of the surface tension Y = F/2L.
 
So by reading you mean the length from the top of the spring to the microscopic slide?
 
No. The spring is used to measure the full due to surface tension. Here length is the length of the slide which is in contact with jelly.
 

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