Final answer:
Laying empty fire extinguishers on their sides after use is true. It helps to indicate that they are empty and reduce the chances of someone using an empty extinguisher to approach a fire.
Step-by-step explanation:
The statement is true. Laying empty fire extinguishers on their sides after use is a commonly followed practice to indicate that they are empty and reduce the chances of someone using an empty extinguisher to approach a fire. By placing the extinguisher on its side, it sends a visual signal that the extinguisher is empty and needs to be refilled. This practice helps prevent confusion and ensures that fully charged extinguishers are readily available in case of an emergency.