Surface Tension at Critical Temperature: Contact Angle?

AI Thread Summary
At critical temperature, surface tension reaches zero, leading to questions about the relevance of contact angle. The concept of contact angle becomes ambiguous since there is no energy cost for creating a material interface. Without surface tension, the traditional understanding of wetting is challenged. The discussion suggests that the notion of wetting may not hold significance at this temperature. Overall, the complexities of surface behavior at critical temperature highlight the limitations of conventional wetting concepts.
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At critical temperature, the surface tension becomes zero.
What happens to contact angle at critical temperature?
 
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It's probably not a meaningful concept. Since there is no energy cost associated with creating a material interface (and no pressure jump across a curved surface) it's not clear what 'wetting' means.
 
thx.. i think my understanding is getting better now
 

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