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An undergraduate laboratory experiment to determine the critical point of SF 6 using light scattering at selected wavelengths
European Journal of Physics ( IF 0.7 ) Pub Date : 2020-10-08 , DOI: 10.1088/1361-6404/aba225
Andrew James Murray , Matthew Harvey

Molecules and atoms that are normally gaseous at room temperature and pressure will liquefy or solidify as their temperature reduces or their pressure increases. In the apparatus detailed here a commercial cell contains pressurized SF 6 so that it exists in both gaseous and liquid states, with the density of both being similar at room temperature. The critical point on the phase diagram can then be investigated, by elevating the temperature of the cell so the densities of liquid and gas equalize. Under these conditions light passing through the cell is highly scattered by density fluctuations in the fluid. By measuring the transmitted light as a function of both temperature and wavelength, the critical exponent can be derived and the effects of light scattering with wavelength investigated.

中文翻译:

一项本科生实验,使用选定波长的光散射来确定SF 6的临界点

通常在室温和压力下呈气态的分子和原子会随着温度降低或压力升高而液化或凝固。在此处详述的设备中,商用电池包含加压的SF 6,因此它既以气态又以液态存在,两者的密度在室温下相似。然后可以通过升高电池温度来研究相图上的临界点,从而使液体和气体的密度相等。在这些条件下,通过细胞的光会因流体中的密度波动而高度散射。通过测量作为温度和波长的函数的透射光,可以得出临界指数,并研究光随波长散射的影响。
更新日期:2020-10-12
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