On critical pressure and critical temperature
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I searched online for relevant definitions as well as various explanations regarding this topic, and I have a question I’d like to ask everyone! The medium in question is ethylene, with a critical temperature of 282.95 K and a critical pressure of 5.3398 MPa. What I want to know is: under conditions of 40°C/5.4 MPa (which are above its critical pressure and critical temperature), is ethylene in a gaseous state or a liquid state? What changes or differences occur in its thermodynamic properties? Thank you in advance for your answers!
It’s neither a liquid phase nor a gas phase; it’s called the critical phase, haha
In the state between gas and liquid, the heat capacity changes, being different from that of either the gas phase or the liquid phase. In fact, the distance between molecules is greater in the gas phase than in the liquid phase.
It should be a gas-liquid blend. I think
It should be called a supercritical state, another homogeneous state distinct from liquid and gas states. Refer to http://baike.baidu.com/view/1180796.htm
It’s 40 degrees, and even at 2700 pressures, it remains in the gas phase.
It’s 40 degrees, and even at 2700 pressures, it remains in the gas phase.