Discussion
An EVS teacher demonstrates an experiment in class in which an egg sinks in a tumbler with water, but floats upon adding salt to the water. Which of the following is the most appropriate explanation she can give to students' enquiry ?
Answer: D
The most appropriate response is to conduct and observe the experiment with different amounts of salt.
In inquiry-based EVS, the teacher does not hand over the explanation but helps children find it. Repeating the experiment with different amounts of salt lets them see that the egg sinks in plain water, floats once enough salt is dissolved, and that more salt makes it float higher. From these observations they can work out that salt makes the water denser, so that it supports the egg.
Telling children that the egg floats due to the density of water gives a term without understanding, and putting off the answer to higher classes discourages enquiry. Letting children add different items at random loses the focus on salt that the experiment is about.
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