Surface Tension at Critical Temperature: Contact Angle?

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i_island0
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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