Which two conditions are required for cloud formation
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Two conditions that are required for cloud formation are:
1. Moisture: The presence of water vapor is essential for cloud formation. Water vapor is the gaseous form of water, and it is produced through evaporation from various sources such as oceans, lakes, and rivers. The amount of water vapor in the air is referred to as humidity. When the air contains a sufficient amount of water vapor, it has the potential to form clouds.
2. Condensation Nuclei: Cloud formation also requires tiny particles called condensation nuclei or cloud condensation nuclei (CCN). These particles can be dust, pollen, pollution, or other airborne particles. They serve as a surface on which water vapor can condense and form liquid droplets. Without condensation nuclei, the water vapor would remain in the gaseous state even if the air is saturated, and cloud formation would be hindered.
To summarize, the presence of moisture in the form of water vapor and the availability of condensation nuclei are the two necessary conditions for cloud formation.