Clouds often form as air rises, expands, and cools. This happens because warm air is less dense and rises, leading to a decrease in pressure and temperature. As the air cools, it can no longer hold all its moisture, leading to condensation and cloud formation. This process is influenced by various factors, including the sun's heat, which warms the Earth's surface and causes air to rise.[
Condensation nuclei, or tiny particles in the air, play a vital role in cloud formation. These particles provide a surface for water vapor to condense into droplets. Without these nuclei, water vapor would remain in the air as an invisible gas. The presence and type of these particles can affect the size and density of the resulting clouds, influencing their appearance and behavior.[