# Differences

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 phy131studiof15:lectures:chapter19 [2015/11/06 09:08]mdawber [Ideal Gas Law] phy131studiof15:lectures:chapter19 [2015/11/11 08:54] (current)mdawber [Using the Ideal Gas Law to determine Absolute Zero] Both sides previous revision Previous revision 2015/11/11 08:54 mdawber [Using the Ideal Gas Law to determine Absolute Zero] 2015/11/06 09:08 mdawber [Ideal Gas Law] 2015/11/06 09:01 mdawber [Thermal Stress] 2015/11/06 09:00 mdawber [19.P.014] 2015/11/06 08:50 mdawber [Thermal Expansion] 2015/07/22 11:47 mdawber [Thermal Stress] 2015/07/22 11:46 mdawber [What makes a gas ideal?] 2015/07/22 11:46 mdawber [Thermal Stress] 2015/07/22 11:43 mdawber created 2015/11/11 08:54 mdawber [Using the Ideal Gas Law to determine Absolute Zero] 2015/11/06 09:08 mdawber [Ideal Gas Law] 2015/11/06 09:01 mdawber [Thermal Stress] 2015/11/06 09:00 mdawber [19.P.014] 2015/11/06 08:50 mdawber [Thermal Expansion] 2015/07/22 11:47 mdawber [Thermal Stress] 2015/07/22 11:46 mdawber [What makes a gas ideal?] 2015/07/22 11:46 mdawber [Thermal Stress] 2015/07/22 11:43 mdawber created Line 185: Line 185: ===== Using the Ideal Gas Law to determine Absolute Zero ===== ===== Using the Ideal Gas Law to determine Absolute Zero ===== - If $PV=nRT$ the absolute zero temperature occurs when $P=0$. In practice most gases will liquefy before this point, but we can measure the pressure of fixed volume of gas at a couple of reference points and extrapolate down to zero pressure to get an estimate for [[wp>​Absolute_zero|absolute zero]]. + If $PV=nRT$ the absolute zero temperature occurs when $P=0$. In practice most gases will liquefy before this point, but we can measure the pressure of a fixed volume of gas at a couple of reference points and extrapolate down to zero pressure to get an estimate for [[wp>​Absolute_zero|absolute zero]]. Through laser cooling and molecular trapping techniques it is now possible (but difficult!) for temperatures on the order of a $\mathrm{nK}$ to be achieved. Prof. [[http://​ultracold.physics.sunysb.edu/​index.html|Dominik Schneble]] produces ultra-cold ($\mu K$) Bose-Einstein condensates in the basement of this building! Prof. [[http://​www.stonybrook.edu/​metcalf/​hmetcalf.html|Hal Metcalf]] was one of the key players in the original development of laser cooling. Through laser cooling and molecular trapping techniques it is now possible (but difficult!) for temperatures on the order of a $\mathrm{nK}$ to be achieved. Prof. [[http://​ultracold.physics.sunysb.edu/​index.html|Dominik Schneble]] produces ultra-cold ($\mu K$) Bose-Einstein condensates in the basement of this building! Prof. [[http://​www.stonybrook.edu/​metcalf/​hmetcalf.html|Hal Metcalf]] was one of the key players in the original development of laser cooling.