为什么He-3的熔化焓为负值?（为什么He-3熔化时放热?）
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/09 05:47:18
为什么He-3的熔化焓为负值?（为什么He-3熔化时放热?）
为什么He-3的熔化焓为负值?（为什么He-3熔化时放热?）
为什么He-3的熔化焓为负值?（为什么He-3熔化时放热?）
Because of the weak,induced dipole-dipole interaction between helium atoms,their macroscopic physical properties are mainly determined by their zero point energy ("ground state kinetic energy").Also,the microscopic properties of helium-3 cause it to have a higher zero point energy than helium-4.This implies that helium-3 can overcome dipole-dipole interaction with less thermal energy than helium-4 can.
Helium-3 boils at 3.19 kelvin compared with helium-4 at 4.23 kelvin,and its critical point is also lower at 3.35 kelvin,compared with helium-4 at 5.2 kelvin.Helium-3 has less than one-half of the density when it is at its boiling point:5.9 gram per liter compared to the 12.5 gram perliter of helium-4 -- at a pressure of one atmosphere.Its latent heat of vaporization is also considerably lower at 0.026 kilo joule per mole compared with the 0.0829 kilo joule per mole of helium-4.
你问的应该是在0.3K以下fusion焓是负值吧 我这里有一份俄亥俄州空军基地的关于He3热力学性质的报告 如果需要我可以提供给你