G3

=Water= 1)Evaporatation is the change of water cycle where the water changes to gas.Evaporation occurs when the earth's surface is heated by the sun, causing the surface water to rise. 2)Condesation is the change of water cycle where the water vapour changes to liquid.Condesation occurs when water vapour gets cooler in the air and changes to water. 3)Boiling is the rapid vaporization of any liquid which occurs when a liquid is heated the boliling point of its own,which is the the temperature where the water boils. 4)The three charateristic stages are nucleate boiling,transition boling and film boiling. 5)All known liquids, except liquid helium, freeze when the temperature is lowered enough. Liquid helium remains liquid at atmospheric pressure even at absolute zero, and can be solidified only under pressure. For most substances, the melting and freezing points are the same temperature; however, certain substances possess differing solid–liquid transition temperatures. For example, agar displays a hysteresis in its melting and freezing temperatures. It melts at 85 °C (185 °F) and solidifies from 31 °C to 40 °C. 6)Evaporation occurs because all molecules of all substances are constantly in motion. Those molecules are constantly in motion, flying back and forth within the water, sometimes colliding with each other. When collisions occur, some molecules gain energy from other molecules. 7)Evaporation from the oceans is the primary mechanism supporting the surface-to-atmosphere portion of the water cycle.