Why are leaking propane tanks that are not on fire considered hazardous?

Leaking propane tanks that are not on fire are considered hazardous primarily because of the frostbite risk associated with direct contact with the escaping gas. Propane exists as a pressurized liquid, and when it leaks, it evaporates rapidly and can drop in temperature significantly. This extreme cold can cause frostbite if it comes into contact with skin, leading to serious injury.

While the other considerations, such as fire risks and potential toxicity, represent important concerns regarding propane, they do not apply to the condition of the tank simply leaking without fire. Fire risks and explosive potential are usually contingent on specific conditions, such as the presence of an ignition source or sufficient quantities of propane in a confined space. Thus, the frostbite hazard is a direct and immediate concern when handling leaking tanks, highlighting why recognizing the risks associated with escaping propane is critical in emergency response scenarios.