Suppose you have two bottles of water (without lids) and you invert one bottle over the other, gravity would make the water from the bottle on top flow down Let’s find out if it is possible for the water from the bottle at the bottom to flow up
What you need:
Two identical, transparent plastic bottles with wide mouths, hot water, cold water, red or any other food coloring: a piece of thick cardboard and, a tray. What you do:
1. Fill one bottle with hot water up to the brim. Add red colour to the water Place the bottle on a tray, on a table
2. Fill the second bottle with cold water. Use the cardboard piece as a lid
3. Holding the lid tightly so that the water does not spill out, invert the bottle of cold water over the bottle of hot water in such a way that the mouth soft the bottles are exactly on top of each other and the card lid is between them.
4. Now gently pull out the card lid – get someone to pull it out as you will need to hold the two bottles.
What you see
You will see the colored, hot water flowing upwards into the bottle containing cold water. After a while, you will find that the water in both the bottles gets colored.
Why it happens
Hot water is lighter than cold water and hence the light, hot, colored water flows up into the bottle on top. The cold water moves down simultaneously and hence the water in both the bottles becomes colored after a while.
Picture Credit : Google
