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.
Introduce the process of condensation. If students do not know what the process of condensation is, you can tell them it is the opposite of evaporation. In evaporation, a liquid (like water) changes state to become a gas (water vapor). In condensation, a gas (like water vapor) changes state to become a liquid (water). Explain that as water molecules in the air cool and slow down, their attractions overcome their speed and they join together, forming liquid water. This is the process of condensation.