What is a key characteristic of the gaseous state at 20 degrees C under standard pressure?

In the context of the gaseous state at 20 degrees Celsius under standard pressure, stating that it is completely gaseous accurately captures a fundamental property of gases. At this temperature and pressure, many substances exist in a gaseous state, meaning that they have sufficient energy to overcome intermolecular forces and occupy a volume that can expand indefinitely. This characteristic allows gases to fill their containers uniformly and to diffuse easily into other gases.

Additionally, while gases can vary in their behavior under different pressures—indicating that they follow principles such as Boyle's Law—it is important to note that under standard conditions, a gas will remain in its gaseous form without condensing into a liquid. The notion of complete gasification aligns well with the understanding that at specified conditions of temperature and pressure, substances can reliably be expected to remain in a gaseous state.