ANSWERS: 7
  • It evaporates
  • It evaporates. This is different from converting from a liquid to a gas via boiling, which is what you correctly describe happening at 100C.
  • the heat sucks it up into the air... its the cycle of water... its called evaporation...
  • Evaporation because of heat which in this case is the sun light
  • It's the process known as evaporation, which can be related to the water cycle. Much more information here: http://science.howstuffworks.com/h2o6.htm EDIT: Seeing you edited your question, I've added this: Factors influencing the rate of evaporation * Concentration of the substance evaporating in the air: If the air already has a high concentration of the substance evaporating, then the given substance will evaporate more slowly. * Concentration of other substances in the air: If the air is already saturated with other substances, it can have a lower capacity for the substance evaporating. * Flow rate of air: This is in part related to the concentration points above. If fresh air is moving over the substance all the time, then the concentration of the substance in the air is less likely to go up with time, thus encouraging faster evaporation. This is result of the boundary layer at the evaporation surface decreasing with flow velocity, decreasing the diffusion distance in the stagnant layer. * Concentration of other substances in the liquid(Impurities): If the liquid contains other substances, it will have a lower capacity for evaporation. * Temperature of the substance: If the substance is hotter, then evaporation will be faster. * Inter-molecular forces: The stronger the forces keeping the molecules together in the liquid state the more energy that must be input in order to evaporate them. * Surface Area: A substance which has a larger surface area will evaporate faster as there are more surface molecules which are able to escape. * Heating : The thickness of the object being heated was thick at a time of heating, the heat being delivered for evaporation of the water could be reduced. If there was no thickness, the heat might have been delivered more to the evaporation of the water. http://en.wikipedia.org/wiki/Evaporation
  • Boiling occurs at 100C at one atmosphere of pressure (sea level). In the mountains it boils at a lower temperature. The boiling point is when all the molecules in the liquid have enough energy (heat) to escape. The reason it doens't blow up is that as the top layer is driven off, it cools the rest slightly. This means that the water can't get hotter than the boiling temp unless you add pressure. (pressure cooker) Evaporation is the same thing but much slower and the rate of loss of water is determined by the air pressure, the humidity and the temperature. Ice will evaporate as well, just much slower. When water evaporates it cools the surface it came from because it took the heat energy with it when the molecules escaped the liquid.
  • The water on the surface will try to saturate the surrouding air (air having less moisture)for this water will use its heat of vaporisation(latent heat),the water molecule jump from water to air. The rate of evaporation will depend upon the relative humidity of that particular day.

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