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Below are definitions of important fog terms.

• advection fog: a cloud of water droplets formed when warm, moist air travels over a cold surface and condenses
• condensation: the process by which water vapor turns into liquid water
• dew point: the point at which water vapor condenses into droplets of water
• haze: dry dust particles in the air
• radiation fog: a cloud of water droplets formed when the cooling ground lowers the temperature of the air above it to its condensation point
• relative humidity: the ratio of the current amount of vapor in the air to how much vapor the air can hold at saturation
• visibility: the distance over which objects can be seen
• water vapor: the invisible gaseous form of water

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