释义 |
joule-thom·son effect \ˈ ̷ ̷ˈtäm(p)sən-\ noun Usage: usually capitalized J&T Etymology: after J. P. Joule and Sir William Thomson (Lord Kelvin) died 1907 British physicist : the change in temperature of a gas on expansion through a porous plug from a high pressure to a lower one under adiabatic conditions, the observation of this change proving among other things that Joule's second law is only approximately true |