A volumetric flask containing liquid cyclohexane is depressurised to a very low pressure by a turbomolecular vacuum pump. The rapid drop in pressure results in a rapid drop in temperature, causing the substance to temporarily freeze, but the system is unstable, flirting with the triple point (a point of pressure and temperature at which a substance is simultaneously solid, liquid, and gas). The re
![Science! - Cyclohexane at the Triple Point](https://cdn-ak-scissors.b.st-hatena.com/image/square/1146dedea567d51dbbfcb393ea692fe4012a51e3/height=288;version=1;width=512/https%3A%2F%2Fi.ytimg.com%2Fvi%2FXEbMHmDhq2I%2Fhqdefault.jpg)