In a phase diagram, the different phases can be identified by their location:
• Solid: can be found at high pressure and low temperature
• Liquid: can be found between the solid and gas regions
• Gas: can be found at low pressure and high temperature
• Triple Point: the point at which all three phases are in equilibrium
• Critical Point: the point at which the liquid and gas phases coexist. The resulting phase is a supercritical fluid.
• Normal boiling point: is the temperature at which a liquid changes into a gas at 1 atm. In the phase diagram, boiling occurs on the line separating the liquid from the gas phase:
Construct the phase diagram of Argon:
Argon has a normal boiling point of 87.2 K and a melting point (at 1 atm) of 84.1 K. Its critical temperature is 150.8 K and critical pressure is 48.3 atm. It has a triple point at 83.7 K and 0.68 atm.
Sketch the phase diagram to answer whether solid argon or liquid argon has the greater density?
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