Determining Surface tension of a liquid with Poiseulle's Law

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SUMMARY

The discussion focuses on determining the surface tension of a liquid using Poiseuille's Law. While the initial inquiry suggests a lack of direct correlation between Poiseuille's Law and surface tension, participants highlight the relationship between fluid viscosity and surface tension. An experimental approach is proposed, involving the measurement of fluid movement in a straw after suction, which can provide insights into surface tension through viscosity calculations.

PREREQUISITES
  • Understanding of Poiseuille's Law and its application in fluid dynamics.
  • Knowledge of fluid viscosity and its relationship to molecular forces.
  • Familiarity with experimental design in physics.
  • Basic skills in measuring fluid dynamics using tools like straws or manometers.
NEXT STEPS
  • Research the relationship between viscosity and surface tension in liquids.
  • Learn about experimental methods for measuring fluid viscosity.
  • Explore advanced applications of Poiseuille's Law in fluid mechanics.
  • Investigate techniques for measuring surface tension directly, such as the drop weight method.
USEFUL FOR

Students in physics, researchers in fluid dynamics, and anyone interested in experimental methods for measuring physical properties of liquids.

rubmail
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Hi. I am doing a physics project and we have been told by my lecturer to find out how to determine the surface tension of a liquid using Poiseulle's Law and to describe an experiment on how to do so. I have no idea how you could do this because none of the variables in the law relate to surface tension as far as I am aware.


Can you please tell me how one would go about determining the surface tension using Poiseulle's Law and describe an experiment for me. This would really help me. Thanks
 
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Well I can't tell you how to make an experiment to find it but there is definitely a relationship between the viscosity of the fluid and the surface tension. If you could find the viscosity you could potentially find the strength of the attractive force between molecules and could adapt this for a point on the surface.
 
rubmail said:
Hi. I am doing a physics project and we have been told by my lecturer to find out how to determine the surface tension of a liquid using Poiseulle's Law and to describe an experiment on how to do so. I have no idea how you could do this because none of the variables in the law relate to surface tension as far as I am aware.


Can you please tell me how one would go about determining the surface tension using Poiseulle's Law and describe an experiment for me. This would really help me. Thanks

Think about sucking the fluid up in a long straw from a glass, and then measuring how fast the surface moves back down after the suction is released.
 

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