Gloves and safety glasses are required when filling containers due to what effect of liquid propane?

Gloves and safety glasses are required when filling containers primarily due to the refrigerating effect of liquid propane. When liquid propane is released from its pressurized container, it rapidly expands and cools down significantly. This dramatic drop in temperature can cause frostbite or cold burns on skin or eyes if contact occurs.

The refrigerating effect is a critical safety consideration because it indicates how quickly liquid propane can absorb heat from nearby objects or flesh, leading to severe injuries. Therefore, protective gear such as gloves and safety glasses is essential to safeguard against these hazards while handling propane, ensuring that workers are protected from potential thermal injuries.