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Previous page page_6 next page > < previous page page_7 next page > Page 7 Assuming that each univalent ion has a charge equal in magnitude to that of one electron, NA = F/e. 99792458 · 108 m · s1. 0221367 × 1023 mol1. From Eqs. 15) it follows that for one mole of gas in the volume V, nM = 1 and n = NA/V so that From Eq. 9) it also follows that the average kinetic energy per molecule is given by The mass per molecule is evidently From Eq. 11) it follows that the number of molecules per cubic centimeter is given by where Pµb is the pressure in microbars and PPa is the pressure in pascal units, while where Pτ is the pressure in Torr.

3. 4. 4. 1. 2. 1. 2. Network Approach General References 10. GasSurface Interactions and Diffusion John B. 1. 1. 2. 3. 4. 5. 6. 7. 8. 2. 1. 2. 3. 4. 5. 6. 3. 4. 1. 2. 3. 4. 5. 6. 7. Bakeout Processes References 11. Ultrahigh and Extreme High Vacuum Paul A. 1. 1. 2. 3. 4. 2. 1. 2. 3. 3. 4. 1. 5. UHV/XHV Hardware 620 620 622 625 628 629 636 639 641 642 642 643 646 647 648 648 652 652 References 12. 1. 1. 2. 3. 4. 2. 3. 1. 2. 3. 4. 4. 5. Measurement of Pumping Speeds References Appendix Graphic Symbols for Vacuum Components Conversion Factors for Pressure Units Vapor Pressure of Common Gases Vapor Pressure of Solid and Liquid Elements General Reference Books on Vacuum Science and Technology 665 670 673 676 676 680 683 686 689 692 695 701 701 708 709 711 714 Index < previous page 715 page_xxi next page > < previous page page_xxiii next page > Page xxiii Acronyms Acronyms used in the text are listed under the chapter where they occur.

Now it is a fact that no change in temperature occurs if two different gases, originally at the same temperature, are mixed. This result is valid independently of the relative volumes. Consequently, the average kinetic energy of the molecules must be the same for all gases at any given temperature, and the rate of increase with temperature must be the same for all gases. 15 + t (t = degrees Centigrade), and k is a universal constant, known as the Boltzmann constant. The total mean translational energy is then where υr is known as the root-mean-square velocity.