The Ring Method

Essay # 53379

The Ring Method

Examines surface tension measurements of pure water, ethanol solution, and 1.5N NaCl using a Pt-Ir ring on a Du Nuoy tensiometer.

2,200 words () | 3 sources | MLA | 2003 Philippines

Paper Summary:

This paper is a technical report on a laboratory experiment on surface tension measurements using the Du Nuoy ring. Samples are pure water, ethanol solution, and 1.5N NaCl. Calculations for the correction factor and other necessary values are included in the discussion.

From the Paper:

"The Du Nuoy ring is the most commonly used apparatus for surface tension measurements. The group used pieces of paper to determine the weight needed to depress the lever arm to zero. For the experiment proper, the ring was thoroughly cleaned and flamed to red heat for a few seconds. The vernier was turned to zero reading and the lever arm made to just touch the zero indicator. The ring was made to contact the surface of the liquid and was carefully submerged until good contact is established. This was then slowly recovered from the liquid by careful downward movement of the platform and of the thumbscrew. It is important that the lever arm is kept at the zero indicator until the ring is detached from the liquid."