Which outcome affects a non-polar molecular substance as temperature significantly increases towards critical point?

💡 Explanation

When temperature increases toward the critical point, the liquid and gas phases become indistinguishable because density difference reduces significantly due to weakening intermolecular forces; and therefore the surface tension diminishes towards zero. Therefore surface tension changes, rather than viscosity increasing, refractive index unchanged, or heat capacity falling to zero since energy scales in other direction.

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