sentence: Cold air can push hot air up because hot air is less dense.
sentences_before: Condensations occurs when water molecules slow down as they cool and change into a solid or liquid. Condensation is the opposite of evaporation. When air rises, it cools by an adiabatic process. Air rises when cold air pushes hot air up.
sentences_after: Rain, snow, sleet, dew, frost, hail, and drizzle are all forms of precipitation. If liquid, it can be measured using a rain gauge. The most common form of solid precipitation is snow. Snow is made when temperatures are so cold that water vapor changes directly to solid crystals.
concept_name: cold air
headings: Precipitation
categories: Meteorology Words