What is the main purpose of using fire suppressants like PKP?

The main purpose of using fire suppressants like PKP (Potassium Bicarbonate) is to inhibit the combustion process. PKP is utilized to extinguish flames by interrupting the chemical reactions that occur during combustion. It achieves this primarily by absorbing heat and forming a barrier that prevents oxygen from reaching the fuel source. This interruption is critical in effectively stopping the fire's spread and ultimately extinguishing it.

In contrast to the correct answer, increasing the temperature of flammable materials would promote combustion rather than extinguish it. Acting as an oxygen source would also exacerbate the fire, as oxygen is a key element that supports combustion. Enhancing the burning process, similarly, would make a fire more intense rather than suppress it. Therefore, these other options do not align with the fundamental function of fire suppressants, which is to stop or inhibit the burning process.