How to Water vapour and Rain

All living things need water to exist. If there was no rain there would not be any drinking water. All the water, which is needed on earth, is provided by rain. All plants, including grass, crops and trees need water to live. Though the atmosphere there is a constant movement of water. Water vapor, which is invisible, rises into the air and falls to the earth as rain. .Evaporation of water: The steam, which you saw from water boiling in a kettle, can be very dangerous. Serious burns can result from the heat energy contained in the steam and in the boiling water. Using a source of heat, water can be boiled. This heat energy causes atoms to break away from each other after a liquid reaches its boiling point. The atom, then evaporates. Energy from the hot sun's rays on molecules of water can cause them to break away from the water surface and evaporation takes place. As molecules evaporate, they carry away the heat energy. However, during  the process of evaporation, the liquid temperature remains constant. Boiling often takes place naturally near active volcanoes when they erupt. Condensation: The turning of water vapor into water is called condensation. This process occurs when water is converted from its gaseous state back into the liquid state.

When water molecules lose their heat energy they condense. This process of condensation is exactly opposite to the process of evaporation. Heat or dry air causes evaporation. Cold air causes condensation. If water vapor toss a cold surface or an object, it condenses. Water is turned into invisible water vapor by the heat of the sun's rays. The process of rain begins with the evaporation of tiny particles or molecules of water from the rivers, lakes, the seas and the oceans. The hot rays of the sun cause the water molecules to evaporate. When they evaporate they are lifted from the water surfaces into the air. Then the rise with the wind in cooler air. The turning of water vapor into water is called condensation. In cooler air, tiny drops of water vapor condense around dust particles. When they float about as masses of minute water droplets, at considerable heights above sea level, they form clouds. When the droplets in clouds coalesce into larger drops between 0.2mm and 6mm they fall as rain. Rain, which falls on the ground, finds its way back to the seas.
The water that falls as rain comes mainly from the oceans and the seas. Before the water becomes rain, it passes through two stages: evaporation and condensation