Is Fog solid or gaseous mater?,can it meet the triple point of water? As per my research,fog rises only if its density is less than that of water as water vapour does,a fact that is forcing me to classify fog as a gaseous mater.Yet the only condition for fog to exist is when temperature is below the triple point of water,where we prospect to have liquid on transition to solid.This fact violates the idea for the triple point of water.
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Fog is not a pure substance, so don't search for its phase. It is a mixture of water and water vapor. So the hydro-static system lies in the liquid-vapor part of this PV diagram.
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Standard everyday fog consists of a mixture of liquid water droplets suspended in water vapour in the air. A nice summary of the formation is given by the National Geographic website encyclopaedic entry about fog as:
There has to be a considerable amount of humidity and often, the presence of very small microscopic aerosols (dust, sea-salt etc etc) to condense on. This is not the triple state of water, which as can be seen in the phase diagram below requires much lower air pressure:
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It is a colloid in which dispersed phase is liquid and dispersed medium is gas. |
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