During cloud formation, what happens to the air as it rises?

• A. It cools down steadily
• B. It expands and cools due to decreasing pressure
• C. It loses moisture
• D. It gains kinetic energy

Answer: (B)

When air rises in the atmosphere, it encounters decreasing pressure as it ascends. This decrease in pressure allows the air to expand. As the air expands, it undergoes a physical change where it cools down, a process known as adiabatic cooling. This cooling occurs because the energy in the air is utilized for the expansion rather than for raising the temperature, which results in the decrease of temperature with height.

This process is critical in cloud formation, as the cooler air can lead to condensation if it becomes saturated, forming clouds. The understanding of how air behaves with changes in pressure and temperature is essential in meteorology and helps explain various weather phenomena. The other options do not accurately describe the process that occurs during the ascent of air.