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Calculating Thickness of Soap Films

CSEF · 2003 Physics & Astronomy

James J. Hriciga · Corona Fundamental Intermediate School, Corona

Overview

Objectives/Goals The objective is to calculate the thickness of a soap film at a variety of constant downward velocities. Methods/Materials To create an adequate soap film solution, 12 teaspoons of regular dish detergent soap and 1 1/2 liters of water were mixed together. The frame of the apparatus was made of PVC pipe. Inside this frame was strung fishing line to form a geometric shape. This was used to provide structure to the flowing flat fluid. The downward velocity, the amount of solution collected per second, and the width of the film were measured and used to calculate film thickness. Results Film thickness increases along with downward velocity. The fastest rate of flow had the greatest film thickness, while the slowest rate of flow had the least. Conclusions/Discussion The results from the experiment support the hypothesis that as the downward velocity of a flat fluid increased, the thickness of the film will also increase.

Summary statement

The project seeks to understand the relationship between downward velocity in a flat fluid and its effect on film thickness.

Help received

Mrs. Bosquez taught scientific procedures and corrected work, father bought needed materials and helped construct the apparatus, Dr. Brent Daniel, Ph.D. (Ohio State University) provided needed equations, pipette tips, and brainstormed possible ideas for experiments, Kinko's helped by laminating display items.

Competition history

  • CSEF 2003 Physics & Astronomy · Entry J1516

Resources

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Source: California Science & Engineering Fair public projects

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