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The temperature, pressure and volume at the critical point are called critical constants. Which of the following is true at the critical point?

  1. AThe gas and liquid phases have identical density
  2. BThe gas has zero volume
  3. CThe pressure is zero
  4. DThe temperature is zero

Answer: A

At the critical point the distinction between liquid and vapour vanishes: both have the same density (the critical density), the same refractive index and all other properties. The pressure and volume are finite.
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