Question

Take a test-tube. Fix some wax at its bottom portion Pour some water in the test-tube. Tilt the test-tube as shown

and heat the water at the top of the test-tube. Observe the wax at the bottom. You will find that the wax has not

melted. Why ​

Answer 1

Answer:

By heating the test tube at its top the wax present at top surface will only melt but the wax present at the bottom of the test tube in water does not melt as thereris no transfer of heat in the donnword direction by convection so the temperture of water at the bottom of the test tube remains constant and there is no change in the state of wax present at the bottom by heating the test tube at the middle the wax at the top surface will melt but the wax present at the bottom surface remains same because heat covection takes place in upwared direction only by heating the test tube at bottom both the wax present at top and bottom melt because heat gets transferred from bottom to top due to convection