G6

=__Water__= 1.Water can exist in 3 interchangeable states. 2.The solid state of water is ice. 3.The gaseous state of water is steam or water vapour. __Condensation __
 * 1) Water can condense. Condensation is a process where gas changes to a liquid.
 * 2) Numerous living beings use water made accessible by condensation.
 * 3) In the water cycle, condensation is the transformation of water vapour to liquid water droplets in the air, creating clouds and fog.
 * 4) Condensation is responsible for your glasses fogging up when you go from a cold room to the outdoors on a hot, humid day, for the water that drips off the outside of your glass of iced tea, and for the water on the inside of the windows in your home on a cold day.
 * 5) Condensation of water vapor within the atmosphere produces clouds.
 * 6) When water vapor from the air naturally condenses on cold surfaces into liquid water, it is called //dew//.
 * 7) Condensation can technically happen at any temperature.

__Freezing __ 2.Water freezes at a freezing point at 0°C. 3. When water loses enough heat,it can change and freeze into a solid. 4. When water loses heat to its surroundings,its temperature drops. __Melting __ __Evaporation __ >
 * 1) Water can freeze. Freezing is a process where liquid changes to a solid.
 * 1) Water can melt. Melting is a physical process where solid changes into liquid.
 * 2) When a solid changes to a liquid upon heating, this change of state is called melting.
 * 3) For a pure substance, melting occurs at a definite or constant temperature.
 * 4) Curing the change of state from ice to water, there is no change in temperature even though thermal energy is being absorbed.
 * 5) A pure substance will solidify or freeze at a temperature equal to its melting point.
 * 6) Salt lower the melting point of ice.
 * 1) Evaporation is the process by which water is converted from its liquid form to its vapour form and thus transferred from land and water masses to the atmosphere.
 * 2) Water can evaporate. Evaporation is a process where a liquid becomes gas.
 * 3) Water is a volatile liquid.(It evaporates easily at room temperature and pressure.
 * 4) The amount of heat, wind, pressure, boiling point of the liquid, and the exposed surface area will affect the rate of evaporation.
 * 5) When clothes are hung on a laundry line, even though the ambient temperature is below the boiling point of water, water evaporates. This is accelerated by factors such as low humidity, heat (from the sun), and wind. In a clothes dryer, hot air is blown through the clothes, allowing water to evaporate very rapidly.
 * 6) The process of evaporation is so great that without precipitation runoff, and groundwater discharge from aquifers, oceans would become nearly empty.
 * 7) Evaporation takes place as molecules of water escape from a collective body of water. This can be a puddle, a lake, a stream, or just a droplet of water.
 * 8) The process of cooling down an object via evaporation is known as evaporative cooling. Many air conditioners are actually evaporative coolers, and work by taking advantage of this process.