Discussion
State whether the following is true or false.
At the critical point the densities of the saturated liquid and the saturated vapour become equal.
Answer: B
Correct answer: True
The critical point is where the saturated liquid and saturated vapour lines meet, so the two phases become identical there - same density, same refractive index, and no meniscus. The latent heat of vaporisation falls to zero for the same reason, since there is no longer any distinction between the phases to overcome.
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