These elementary school science experiments use an egg to teach the students the effect of heat on objects in different state.
Objective:
1.Heat changes state of egg from liquid to solid.
2.While heating air expands, and thus creates a low pressure area. To compensate the pressure difference air from outside flows into the low pressure area.
Materials:
Eggs
Pan
Glass bowl ( with short neck so that the egg just fits like a cork)
Heater
Procedure:
Activity 1:
- Take one egg and break it. Let them watch the raw egg. Now keep it aside.
- Take another egg and place it in the pan. Now pour water till it covers the egg. Place it over the fire and let it boil for some time ( say for eight to ten minutes).Remove from fire and drain the hot water. Pour some cold water and leave the hot egg in it for two or three minutes.
- Crackle shell and remove it. Instruct them to notice the difference.
Analysis and conclusion: Children will notice that on heating egg changed its state from liquid to solid. They will arrive at a conclusion that heat brings changes to the state of a matter.
Activity 2:
- Place the cooked soft egg on the mouth of the glass bowl so that it fits well.
- Ask the students whether they can get the egg into the bowl.
- Instruct them to watch the activity. Place the bowl over fire. After some time (say 3 or 4 minutes) the egg will be pushed into the bowl.
- Let your students think for some time to arrive at a conclusion.
Analysis and Conclusion: They will understand that egg is pushed from outside. They will arrive at a conclusion that, due to heat air expands and this created a low pressure area inside the bowl. Air from outside, which is at a higher pressure, rushes into this low pressure area to compensate this pressure difference. In this process it pushes the cap ( here cooked egg).
Conclusion: These two activities are intended to arise interest for science in the minds of elementary school children. These two simple elementary school science experiments can be used to encourage children to observe nature closely and to arrive at a scientific explanation for simple and interesting phenomenon around them.
