Fire extinguisher in the early 60s and Purple-K being developed by the US Navy in the late 1960s. Manually applied dry agents such as graphite for class D (metal) fires had existed since WWII, but it wasn't until 1949 that Ansul introduced a pressurized extinguisher using an external CO2 cartridge to discharge the agent. Met-L-X (sodium chloride) was the first extinguisher developed in the US, with graphite, copper, and several other types being developed later. In the 1970s, Halon 1211 came over to the United States from Europe where it had been used since the late 40s or early 50s. Halon 1301
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