Thermal energy added or removed from a substance that changes the state of the substance is called

The maximum density of water occurs at a temperature of 

A vapour whose molecules are in dynamic equilibrium with those of its own liquid is said to be

The diagram above illustrates two waves of equal amplitudes A and frequencies approaching each other. When the two waves meet at a point I midway between them, the vertical displacement of the resulting wave will be

A rainbow is formed when sunlight is incident on water droplets suspended in the air due to