Which gas is characterized as being heavier than air?

Propane is characterized as being heavier than air, which is a critical property to consider when discussing its safety and behavior in the event of a leak. When propane gas is released, it tends to settle in low-lying areas because of its higher density compared to air, which can lead to hazardous situations. This property makes proper ventilation an important factor in environments where propane is used.

In contrast, gases like hydrogen are lighter than air, so they would rise, and natural gas is also lighter than air. Oxygen, while essential for combustion, is similarly lighter than air. Understanding the density of these gases relative to air is vital for safe handling, storage, and emergency response, particularly in preventing potential explosions or fire hazards associated with heavier-than-air gases like propane.