A group of students in a school were supposed to demonstrate some experiments in a science exhibition to be conducted on the National Science Day. As a part of planning for the above activity. They gatered in the science laboratory and were discussing their ideas. Smith took a beaker of water and a piece of charcoal. He asked his friends to predict whether it will float or sink in the water. Most of them said that it would float and it actually did. He then asked them whether anybody could make it sink in the water. After a few seconds of silence, Andy came forward and said he could do it by boiling the beaker containing water and charcoal. Then all of them were astonished to see the charcoal slowly sinking in the water. Predict the principle involved in the above experiment.

Explanation

Charcoal is porous in nature and air is present in the pores of charcoal. So in the first case it floats on the water. In the second case, on bonding air escapes from its pores and hence, its density becomes more thus, it sinks in the water.