Fire extinguisher five categories. In the UK the use of Halon gas is now prohibited except under certain situations such as on aircraft and in the military and police. Fire extinguishing performance per fire class is displayed using numbers and letters such as 13A, 55B. EN3 does not recognise a separate electrical class - however there is an additional feature requiring special testing (35 kV dielectric test per EN 3-7:2004). A powder or CO extinguisher will bear an electrical pictogramme as standard signifying that it can be used on live electrical fires (given the symbol E in the table). If a water-based
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