What Is the Difference Between Fog and Mist? 霧和靄有什么不同？

楊舟

What is fog？

Have you ever walked out of your front door in early morning and faced a thick covering of white air that prevented you from seeing more than a few feet in front of you？ This is known as a fog. It is actually a type of stratus1 cloud but is called by a different name because it forms by a different process.

什么是霧？

你曾經(jīng)有過在清晨走出門，面對一層厚厚的白茫茫的空氣，看不到前面幾英尺開外的地方的經(jīng)歷嗎？這就是所謂的霧。它實際上是一種層云，但由于不同的形成過程，它被冠以的不同的名稱。

How is fog formed？

A stratus cloud is any low-lying cloud that makes the atmosphere hazy2. Like all clouds， they are formed when water vapour3 condenses4 when it rises to a cooler part of the earths atmosphere. However， a fog is different because the water vapour reaches its dew point （the temperature at which it turns back into water droplets） right over the surface of the earth. We cannot see water vapour because it is a gas， but when it turns back into water droplets， it becomes visible5 to the eye. This rapid cooling just over the ground could be caused by a number of reasons.

霧是怎么形成的？

層云是使大氣朦朧的低云。和所有的云一樣，它們是在水蒸氣上升到地球大氣層較冷的地方時凝結而成的。然而，霧是不同的，因為水蒸氣達到露點（它變成水滴的溫度）是在接近地面的地方。我們看不到水蒸氣，因為它是一種氣體，但當它變成水滴時，它就變得肉眼可見了。地面上的這種快速降溫可能是多種原因造成的。

What causes fog？

Falling rain can cool down the water vapour and cause it to remain suspended6 close to the ground as a fog.

When there is a big difference between the temperatures of the day and night， the land continues to lose the heat it absorbed7 during the day. The cool night air sandwiches the water vapour close to the ground resulting in a fog.

Finally， when warm， moist8 air blows over a cold surface like ice or snow， it cools it down rapidly and turns to fog.

霧的成因是什么？

下雨可以使水蒸氣降溫，并使其像霧一樣懸浮在靠近地面的地方。

當晝夜溫差較大時，土地白天吸收的熱量持續(xù)流失。夜間的冷空氣把靠近地面的水蒸氣夾在中間，形成了霧。

最后，當溫暖潮濕的空氣吹過像冰或雪一樣冷的表面時，它會迅速冷卻并變成霧。

Fog and mist

You may wonder what the difference between fog and mist is. Well they are actually one and the same. A mist is simply a fog that isnt very thick.

Fog and mist are both created by water droplets， differing only in their overall locations and density9. Fog is a cloud that reaches ground level， even if that “ground” is a hill or mountaintop. Mist forms wherever water droplets are suspended in the air by temperature inversion10， volcanic11 activity， or changes in humidity12. Fog is denser13 than mist and tends to last longer. In terms of visibility14， fog reduces it to less than one kilometer， while mist can reduce visibility to between 1 and 10 kilometers.

The exact definition is if you cannot see an object that is less than 1 km in a mist， it is considered a fog.

霧與靄

你可能會想霧和靄有什么區(qū)別？其實它們是一樣的。靄只是一種不太濃的霧。

霧和靄都是由水滴形成的，只是它們的整體位置和密度不同。霧是到達地面的云，即使“地面”是山丘或山頂。由于氣溫逆增、火山活動或濕度變化，水滴懸浮在空氣中會形成靄。霧比靄更濃，而且往往持續(xù)時間更長。在能見度方面，霧使能見度降低到1千米以下，而靄則使能見度降低到1至10千米。

確切的定義是，如果你在霧靄中看不到距離小于1千米的物體，那那就是霧?！?br>