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A cloud is a hydrometeor, seen as an aggregate of minute particles of liquid water or ice, or of both, suspended in the free air, usually not touching the ground. Clouds may also include larger particles of liquid water or ice and non-aqueous liquid or solid particles, such as those present in fume, smoke and dust. Clouds can form anywhere in the atmosphere, and although they are made of condensed liquid, they are also light enough to be suspended in the air and moved from place to place by the wind.

Formation of clouds

Clouds are created by condensation or deposition of water above the Earth's surface. In general, any air mass that becomes saturated (relative humidity becomes 100%) develops clouds. Saturation can occur due to: cooling moisture gain (from Earth´s surface [...]

Classification of clouds

Clouds are classified according to appearance and height. Based on appearance, there are two major types: Clouds of vertical development, cumuliform, formed by the condensation of rising unstable air –heaped clouds-. Clouds that [...]

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