What is the source of the heat that is needed for the water in the ponds near your house or the river to change in the same way?

What is the main source of heavy water?

What are the sources of phosphate pollutio of water?

What are the elements obtained from sea water source?

What do you see is done to the stains which form on the basins or floorin your house?

A solid and a hollow cylinder of the same size and made of the same material are heated for the same change of temperature. Will the expansions be the same? Explain your answer.

What changes of protein of egg, meat, fish take place on heating?

What is the heat needed (in J) to increase the temperature of 5 g water by 1^@C ?