Try it Yourself Â». In the example above, the background image is shown in the same place as the text. We want to change the position of the image, so that it does not disturb the text too much. The position of the image is specified by the background-position property:
Given enough time and an average energy less than 100^@C, all the molecules in liquid water will become gas, and evaporate. Condensation is the return of molecules from the gaseous state to the surface of the liquid. For example, an individual water molecule will remain in suspension in the atmosphere. When enough water molecules join together, the molecules will form a rain drop or snow crystal and fall to the earth.
Condensation is a chemical reaction in which two or more molecules join together to form a new substance. Water or some other simple substance may be given off as a by-product. Some polymers, such as nylon, can be formed by condensation reactions.