By Joseph M. Powers
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It is critical that the temperature here be the absolute temperature. 8 Here n is the number of moles. 02214179 × 1023 molecules in a mole, where N is Avogadro’s number. Also R is the universal gas constant. 314472 kJ . 7) In this class the over bar notation will denote an intensive property on a per mole basis. Intensive properties without over bars will be on a per mass basis. Recall the mass-basis 7´ ´ E. Clapeyron, 1834, “M´emoire sur la puissance motrice de la chaleur,” Journal de l’Ecole Polytechnique, 14: 153-190.
CC BY-NC-ND. 08 September 2011, J. M. Powers. 7. SECONDARY VARIABLES AND UNITS These quantities varied with pressure however, so that different values would be obtained on top of a mountain versus down in the valley, and so this is not a good standard. 15 ◦ C as absolute zero in K. The triple point of water is defined at the state where three phase of water (solid, liquid, and gas) are observed to co-exist. 15. 9) The English equivalents are degrees Fahrenheit (◦ F ) for relative temperature and degrees Rankine (◦ R) for absolute temperature.
360532 kg. 37) Now as long as the piston does not touch the stops, it will be in a force balance giving Patm A = P A. So our atmosphere must be at Patm = 200 kP a. As the air cools, its temperature will go down. Since P v = RT , as temperature goes down with constant P , we expect the volume to decrease. Just when the piston hits the stops, the stops still exert no force on the piston, so P2 = P1 = 200 kP a. 2 m3 . 554735 . 575 K. 41) Now after the piston reaches the stops, the volume is constant.