Surface tension describes the ability of a fluid to withstand gravity. For example, water forms droplets on the table surface, as water molecules are attracted to each other, which counteracts gravity. It is due to surface tension that heavier objects, such as insects, can be held on the surface of the water. Surface tension is measured in force (N) divided by a unit of length (m), or in the amount of energy per unit area. The force with which water molecules interact (cohesive force) causes tension, resulting in droplets of water (or other liquids). Surface tension can be measured using a few simple objects that are in almost every home, and a calculator.
Lesson 21. Laboratory work No. 05. Measurement of the surface tension of a liquid (report)
Laboratory work No. 5
Subject: “MEASURING SURFACE TENSION OF A LIQUID”
Purpose: determine the coefficient of surface tension of water by the method of separation of drops.
Equipment: a vessel with water, a syringe, a vessel for collecting drops.
- Draw a table: