• Question: why does fog form even when there has been no recent rain or sun?

    Asked by lara.c to Gemma, Hussain, Robert, Ross on 9 Nov 2015.
    • Photo: Hussain Jaffery

      Hussain Jaffery answered on 9 Nov 2015:

      Fog tends to form when warm air passes over or collides with cold air. So wherever you’ve seen this effect, you’ll have to imagine the invisible warm air blanket covering a lower layer of cold air closer to the ground. The warm air traps the cold air but also makes the water vapour in it visible as fog.

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