การออกแบบกระบวนการทดลองวัดความตึงผิวของของเหลวด้วยวิธี Pendant Drop โดยใช้โปรแกรม Tracker

Vitchuda Suknui; Ratchaneewan Siri

Authors

Vitchuda Suknui Division of Physical Science, Faculty of Science, Prince of Songkla University
Ratchaneewan Siri Division of Physical Science, Faculty of Science, Prince of Songkla University

Keywords:

Surface tension, Young-Laplace equation, Liquid droplet, Tracker software

Abstract

This research aimed to: (1) design an experimental procedure for measuring the surface tension of liquids, suitable for resources and budget limitations, (2) apply image analysis technology using Tracker software, and (3) evaluate the developed experimental setup’s feasibility and accuracy for future practical implementation in science education. The study focused on measuring the surface tension of water and vegetable oil using the Pendant Drop Method. The research process consisted of two main steps: (1) designing an experimental setup for capturing images of liquid droplets, and (2) analyzing the shape of the droplets from the captured images by applying Tracker software to measure relevant parameters and calculate surface tension using the Young–Laplace equation. The results demonstrated that: (1) the developed experimental setup was capable of capturing clear images of liquid droplets while employing low-cost equipment and aligning well with resource limitations; (2) the application of Tracker for image analysis effectively enabled the measurement of relevant parameters and the calculation of liquid surface tension using the Young–Laplace equation, with the obtained values showing trends consistent with the standard values of water and vegetable oil; and (3) the experimental procedure is suitable for instructional implementation, as it involves non-complex steps and yields measurement errors within acceptable limits.

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