Fire extinguisher older models also achieved class B and C fire-fighting capability in the past, current models are rated A:K (Amerex, Ansul, Buckeye and Strike First) or K only (Badger/Kidde). Clean agents extinguish fire by displacing oxygen (CO or inert gases), removing heat from the combustion zone (Halotron-1, FE-36, Novec 1230) or inhibiting the chemical chain reaction (Halons). They are referred to as clean agents because they do not leave any residue after discharge which is ideal for protecting sensitive electronics, aircraft, armored vehicles and archival storage, museums, and valuable documents. Halon was completely banned in Europe and Australia except for critical
Gas in a box gas can no longer be considered to be a Maxwell–Boltzmann gas. where "Λ" is now the thermal wavelength for massless particles. The following sections give an example of results for some specific cases. For this case: Integrating the energy distribution function and solving for "N" gives Substituting into the original energy distribution function gives which are the same results obtained classically for the Maxwell–Boltzmann distribution. Further results can be found in the classical section of the article on the ideal gas. For this case: Integrating the energy distribution function and solving for "N" gives the particle number where Li("z") is