Final answer:
PJP extinguishers, also known as Purple K extinguishers, typically come in two sizes: 9-liter and 6-liter, with potassium bicarbonate as the extinguishing agent suitable for class B and C fires.
Step-by-step explanation:
The two sizes of PJP extinguishers, which are often referred to as Purple K extinguishers, are typically found in two sizes: 9-liter and 6-liter. These are usually filled with a potassium bicarbonate-based dry chemical extinguishing agent, effective against class B and C fires. The larger size extinguisher provides a greater capacity for extinguishing fires and is suitable for larger areas or more substantial fire risks, while the smaller size is more manageable and easier to use in constrained spaces or for quicker response situations.