by Ryanna Kelly

What Frost Is
Frost is water vapor that becomes a layer of water crystals on anything that is outside in saturated air. For example, you might frost on your car, windows, and plants.
Frost forms on an outside surface that’s temperature is past the dew point. The dew point is when the air gets really cold, the water vapor in the air or atmosphere turns in a liquid. Then, the liquid freezes, and if it gets cold enough, tiny bits of ice, or frost, form. Finally the ice arranges into ice crystals.
Types of Frost
There are many different types of frost. Not just the ones you see on the window, which is window frost. The most common types of frost are radiation frost (aka hoarfrost), advection frost, rime, and of course, window frost.
Radiation frost is in a form of small ice crystals that will usually show up on the ground or on exposed things. Hoarfrost also form in fridges and freezers.
Advection frost is a collection or group of little ice spikes. It forms when a cold wind blows around the branches of a tree, poles, and other things.
Rime is frost that forms very quickly. It usually forms in very cold, and wet climates, or very windy weather. Sometimes rime looks like regular solid ice.
And finally, there’s window frost. This type of frost forms when a glass window is exposed to cold air outside and in moist air inside.