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...Rarefied gas dynamics and its applications to vacuum technology f sharipov universidade federal do parana curitiba brazil abstract basic concepts of are given in a concise form some problems flows considered namely calculations velocity slip temperature jump coefficients flow through tube due pressure gradients thin orifice results on the two last over whole range rarefaction methodology for modelling holweck pump is described an extensive list publications these topics brief history based kinetic approach maxwell abandoned idea that all gaseous molecules move with same speed introduced statistical medium he distribution function obtained expression equilibrium state thus gave origin theory gases then boltzmann deduced equation which determines evolution systems being out knudsen measuring rate detected deviation from poiseuille formula at low such was explained by fact certain not continuous valid anymore description required development new this can be as beginning later advances wer...