G1

=Water=

Evaporation 1. Water can evaporate at any temperature. 2. Evaporation is the process when liquid changes its state into gas. 3. At higher temperatures the number of energetic molecules is greater, and evaporation is more rapid. 4. Evaporation is also increased by increasing the surface area of the liquid or by increasing the air circulation, thus carrying away the energetic molecules leaving the liquid before they can be slowed enough by collisions with air molecules to be reabsorbed into the liquid.

Freezing 1. Water will freeze if its temperature is 0 degree Celsius or below. 2. When the water temperature reaches down to 4 degree Celsius or slightly below, microscopic ice crystals start forming. 3. When microscopic ice crystals starts to join together, it forms into ice. 4. There is water particles and when its liquid, the water particles are at ease. But when it starts to freeze, the water particles started bonding together and became a solid. = = Melting 1.The melting point is often equal to the freezing point. 2.When ice melt, the molecular entities in the solid breaks down to a less-ordered state and the solid liquefies. 3.The molecules will be separating as the ice melts.



Condensation 1.Condensation can lead to mould which can contribute to asthma and other respiratory problems. 2.The point at which the water held in the air changes form vapor to liquid is known as the dew point. 3.It takes place when water vapor in the air condenses from a gas, back into a liquid form, and leaves the atmosphere, returning to the surface of the Earth. 4.Usually in order for condensation to take place, the atmosphere must be fully saturated. In other words, the maximum vapor pressure must have been reached. 5.In the atmosphere, condensation often takes place around dust particles or other particulates such as smoke and even microscopic bacteria.