Water _____ on freezing.
In which of the following cases, evaporation of water will be slowest?
(a) A tray of water kept in sunlight (b) A kettle of water kept on a burner (c) A glass of water kept in a room (d) A bucket of water kept on a rooftop
A ________ is a water tight boat and can travel underwater like a normal ship on the surface of the water.
Give one example of water a physical change and water a chemical change .