Abstract: An apparatus for measuring the fluid flowrate through a system whose through flowrate is to be measured, which includes a first chamber in fluid communication and substantial pressure equilibrium with a constant pressure source, a second chamber in fluid communication with the constant pressure source through a flow restrictor whose through flowrate is substantially equal to the through flowrate of the system to be measured, a valve having an upstream port in fluid communication with the second chamber and a downstream port adapted to receive and connect with the system to be measured, the valve being selectively actuable to establish or block fluid communication between the second chamber and the system to be measured, and a measuring device for measuring the pressure difference between the first and second chambers.

Abstract: A liquefied gas apparatus, in particular a gas lighter for smokers, is disclosed, utilizing a vaporizer-pressure reducer assembly including a pressure reducing device situated generally within a vaporizer. All solid materials with which the assembly is in contact have a thermal conductivity in the range 0.3 to 5 kcal/m/h/.degree. C.