11. The carrier gas linear velocity affects the analysis in the same way that temperature does ( see above ). 12. The process involves evaporation of the organic material over a substrate in the presence of an inert carrier gas . 13. When a carrier gas is used to deliver water vapor, the carrier gas molecules generate a partial pressure. 14. When a carrier gas is used to deliver water vapor, the carrier gas molecules generate a partial pressure. 15. Some authorities believe this system was a disc generator with a helium and argon carrier gas and potassium ionization seed. 16. Helium remains the most commonly used carrier gas in about 90 % of instruments although hydrogen is preferred for improved separations. 17. Bubblers are simple devices that add water vapor to a carrier gas stream as the carrier gas bubbles through a water vessel. 18. Bubblers are simple devices that add water vapor to a carrier gas stream as the carrier gas bubbles through a water vessel. 19. The output signal is proportional to the concentration of CO 2 in the carrier gas , from the oxidation of the sample aliquot. 20. Metal powders are delivered and distributed around the circumference of the head either by gravity, or by using a pressurized carrier gas .