Discussion :: GATE Metallurgical
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A liquid droplet (β) is on a substrate (δ) and is surrounded by air (α), as shown below. The angle of contact (θ) is determined using the following expression:
A.
θ = cos-1{(ϒαδ - ϒβδ)/ϒαβ}
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B.
θ = cos-1{(ϒαδ - ϒαβ)/ϒαβ}
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C.
θ = cos-1{(ϒαδ - ϒβδ)/ϒαδ}
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D.
θ = cos-1{(ϒαδ - ϒβδ)/ϒβδ}
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Answer : Option A
Explanation :
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