![]() Sea fog, for example, which forms over oceans and other bodies of salt water, forms when water vapor condenses around salt in the air. Some type of air pollution or dust particles must also be present, because the water vapor condenses around the particles to form the fog. Water vapor isn't the only thing that must be present, however. As it condenses, the water vapor molecules combine, which in turn form water droplets that hang in the air, according to National Geographic. The droplets are what make fog visible, because water vapor, like all gases, is invisible.įog develops in humid conditions, because there has to be a lot of water vapor in the air for it to form, National Geographic reports. ![]() ![]() When it does, it's because of a combination of factors, including humidity and temperature. Fog is basically a cloud, but while clouds can form at any altitude, fog only forms at low altitudes, near the ground, according to the National Oceanic and Atmospheric Administration (NOAA).įog develops when water vapor - the gas form of water - condenses. Have you ever looked out the window on an otherwise clear day and wondered where the fog suddenly came from? Or woke up and looked out the window to be surprised you can't see the house across the street because of a heavy blanket of fog?įog sometimes seems as though it comes out of nowhere, obscuring views and limiting visibility suddenly and significantly. ![]()
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