Final answer:
A stored-pressure fire extinguisher has pressure stored inside and does not require an external pressure source. The internal pressure remains constant regardless of the temperature.
Step-by-step explanation:
A stored-pressure fire extinguisher is an extinguisher that has pressure stored inside it. It does not require an external pressure source to function. The pressure is generated by the stored gas or liquid inside the extinguisher.
For example, a fire extinguisher filled with CO₂ to a pressure of 20.0 atm at the factory will have the same internal pressure regardless of the temperature it is exposed to. So, the internal pressure of the fire extinguisher will remain at 20.0 atm.