What process involves the transition from a gas to a liquid?

The process that involves the transition from a gas to a liquid is called condensation. This phenomenon occurs when water vapor (gas) cools down and loses energy, which allows the molecules to come together to form liquid water. This process is commonly observed in various everyday situations, such as when moisture forms on a cold glass or when dew collects on grass in the morning.

In the context of sonography and various physical principles that may be relevant to the field, understanding phase changes like condensation can be crucial, especially in relation to how ultrasound equipment may interact with different states of matter and the importance of temperature control in various procedures.

The other processes listed, such as evaporation, involve different transitions (from liquid to gas), while filtration and absorption pertain to different mechanisms of separating or taking in substances rather than phase changes.