Describe the acronym PASS in fire extinguisher usage.

The acronym PASS stands for Pull, Aim, Squeeze, and Sweep, which is a critical method for using a fire extinguisher effectively.

Starting with "Pull," this refers to removing the pin that locks the handle; this step is essential to activate the extinguisher. Next, "Aim" directs the nozzle towards the base of the fire, which is important because targeting the flames directly can be ineffective – fires must be extinguished at their source. Following that, "Squeeze" means to squeeze the handle to release the extinguishing agent, thus allowing it to flow out and work against the fire. Lastly, "Sweep" involves moving the nozzle side to side at the base of the fire, ensuring that the extinguishing agent covers the area thoroughly to eliminate the flames.

This sequence is crucial for using a fire extinguisher safely and effectively, making it vital knowledge for anyone who might have to tackle a fire emergency.