1. Sublimation The transitions of a substance from the solid phase directly to the vapour phase, or vice versa, without passing through an intermediate liquid phase.
2. Sublimation is the process of a solid changing form a gas to a solid without going to the liquid state and vice versa. An example of sublimation is the ice cubes in freezer over a period of time they will begin to sublimate due to the temperature. This also happens when you place your clothes on a line outside when it is below freezing. The water freezes then sublimates and your clothes will be dry but very cold. There is one gas that changes to a solid directly at -109 degrees Fahrenheit and that is carbon dioxide. a gas can go to a solid if at the right temperature but some are very low to go directly to a solid so for an easier process they got to the liquid state by going to a higher temperature , so that then it can be frozen and then begin to sublimate example: Helium transforms to a liquid at -452.1
degrees Fahrenheit, if then frozen while in the liquid state it will then turn out to be a solid and begin to sublimate over a period of time. Hydrogen transforms to a liquid at 422.9 degrees Fahrenheit. If at that point in time it is frozen to a solid, that phase will start to sublimate over a period of time into a gas
3. Sublimation (in chemistry) is the process by which a solid is converted on heating directly into a gas, without going through a liquid state. Only a small number of solids sublime, carbon dioxide, CO2 and iodine, I2, being examples. Ammonium chloride, NH4Cl, sublimes on heating, but the vapour is a...
Not an essay, but good!
Not really an essay. Nevertheless, it's nice to see that you have included a dictionary definition of sublimation along with some examples. I don't know why you have repeated yourself THREE TIMES. I take it these are three definitions are from three different dictionaries, books or whatever?. If so, then you should cite your sources (http://www.noodletools.com/quickcite/).
In conclusion, there are some clear and well written definitions here. GOOD JOB!
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