Fire Triangle / Tetrahedron and Fire Extinguisher Classification

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(TRUE or FALSE) NFPA 9 The definition for clean agent, as defined in NFPA 99 (2021), chapter 3 3.3.22: states:
(TRUE or FALSE) NFPA 99 - 14.2.1.2.2 states: The room housing a Class A, Class B, or Class C chamber shall contain a minimum of one 2-A:10B:C portable fire extinguisher.
What does a UL rating mean?
For portable fire extinguisher with a rating of 2-A:10B:C, what does 2-A mean?
The ideal gas law, also called perfect gas law, is the relation between the pressure which of the following:
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