Dwg: Article written and Venn diagram created.

2025-12-24T16:05:26Z

Article written and Venn diagram created.

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== Fog vs. Mist ==

Fog and mist are both atmospheric phenomena consisting of suspended water droplets that reduce visibility at or near the Earth's surface.<ref name="ref1" /> They are essentially clouds that form at ground level when water vapor condenses.<ref name="ref2" /> The primary distinction between the two is based on the density of the water droplets, which directly impacts the degree of visibility reduction.<ref name="ref3" />

By international meteorological definition, the key difference is a specific visibility threshold.<ref name="ref1" /> An atmospheric obscurity is classified as fog if the horizontal visibility is less than 1 kilometer (approximately 5/8 of a mile).<ref name="ref4" /> If the visibility is 1 kilometer or greater, it is referred to as mist.<ref name="ref3" /> Fog is denser and thicker than mist, appearing as a whitish veil that can significantly obscure the landscape, while mist is less dense and typically forms a thinner, greyish veil.<ref name="ref4" /><ref name="ref1" />

The formation of both fog and mist occurs when air becomes saturated with water vapor, either through cooling to its dew point or by the addition of moisture.<ref name="ref5" /> This causes the water vapor to condense around microscopic airborne particles, such as dust or salt, known as condensation nuclei. The conditions for formation are similar, though fog generally requires a higher concentration of condensed water droplets to achieve its lower visibility.

=== Comparison Table ===
{| class="wikitable"
|-
! Category !! Fog !! Mist
|-
| '''Visibility'''
| Less than 1 kilometer (0.62 miles).<ref name="ref4" />
| 1 kilometer or more.<ref name="ref3" />
|-
| '''Density'''
| Higher density of water droplets, appears more opaque.<ref name="ref1" />
| Lower density of water droplets, appears more translucent.<ref name="ref3" />
|-
| '''Appearance'''
| A thick, whitish veil that can obscure landscapes.<ref name="ref4" />
| A thin, greyish veil.<ref name="ref4" />
|-
| '''Relative Humidity'''
| Typically forms when relative humidity is between 95% and 100%.<ref name="ref1" /><ref name="ref5" />
| Forms when relative humidity is high, generally above 95%.<ref name="ref1" />
|-
| '''Droplet Size'''
| Droplet sizes can vary, but are generally smaller than 100 microns (0.1mm) in diameter.<ref name="ref5" />
| Droplets are also small, with some sources indicating sizes between 30 and 60 microns.
|-
| '''Dissipation'''
| Tends to be more persistent and takes longer to dissipate.<ref name="ref1" />
| Can dissipate more rapidly, especially with light wind.<ref name="ref3" />
|}

[[File:Venn_diagram_Differences_between_Fog_versus_Mist_comparison.png|thumb|center|800px|alt=Venn diagram for Differences between Fog and Mist|Venn diagram comparing Differences between Fog and Mist]]

=== Composition and Feel ===
Both fog and mist are composed of tiny liquid water droplets suspended in the air.<ref name="ref1" /> The air within fog often feels damp or wet to an observer.<ref name="ref4" /> While the core composition is the same, the concentration of these droplets is what creates the difference in visual density and opacity. Due to its higher density, fog is more effective at scattering light, which is why it appears thicker and reduces visibility more significantly than mist.<ref name="ref5" />

== References ==
<references>
<ref name="ref1">[https://wxguys.ssec.wisc.edu/2022/09/12/mist-and-fog/ "wisc.edu"]. Retrieved December 24, 2025.</ref>
<ref name="ref2">[https://geoafrikana.medium.com/whats-the-difference-between-cloud-fog-haze-and-mist-a06c7cf0cbf3 "medium.com"]. Retrieved December 24, 2025.</ref>
<ref name="ref3">[https://weather.metoffice.gov.uk/learn-about/weather/types-of-weather/fog "metoffice.gov.uk"]. Retrieved December 24, 2025.</ref>
<ref name="ref4">[https://cloudatlas.wmo.int/fog-compared-with-mist.html "wmo.int"]. Retrieved December 24, 2025.</ref>
<ref name="ref5">[https://www.metoffice.gov.uk/blog/2025/whats-the-difference-between-mist-fog-and-haze "metoffice.gov.uk"]. Retrieved December 24, 2025.</ref>
</references>

[[Category:Comparisons]]

Differences between Fog and Mist - Revision history

Dwg: Article written and Venn diagram created.