What is the positioning of gases on a phase diagram in relation to temperature and pressure?

In a phase diagram, gases occupy the region characterized by high temperatures and low pressures. This positioning reflects the behavior of gas particles, which are widely spaced apart compared to solids and liquids. At high temperatures, gas particles have enough kinetic energy to overcome intermolecular forces, allowing them to exist in the gas phase even when pressure is relatively low. Therefore, the correct answer highlights that gases are found at the highest temperatures and lowest pressures, illustrating the conditions under which gases naturally occur.

Higher temperatures provide the energy needed for particles to move rapidly and escape from the attractions of other particles, which is why gases can be sustained under these conditions. Low pressure allows gas particles to spread out further, resulting in a gaseous state rather than being forced into the more compact liquid or solid states. In summary, the correct answer accurately captures the typical conditions that favor the existence of gases on a phase diagram.