An Amott-Harvey index less than -0.3 corresponds to a large value for this dimensionless quantity.
An Amott-Harvey index less than -0.3 corresponds to a large value for this dimensionless quantity. In a fakir state, but not an impaled state, this quantity for a mixture is linearly weighted by the areal fraction of each component. This quantity can be measured empirically by plotting mass squared versus time in the Washburn method. It can also be measured using a goniometer on a surface with micro-patterned PDMS pillars. The Cassie-Baxter model reformed the Wenzel model for explaining this quantity's (*) hysteresis. If this quantity is zero, then the Wilhelmy and de Nouy methods simplify to the same thing. From a force balance, the solid-gas minus the solid-liquid surface energies equals the liquid-gas surface energy times the cosine of this quantity in the Young-Dupre equation. It exceeds 150 degrees in the lotus effect and is determined by the ray lying tangent to a liquid droplet. For 10 points, name this angle that characterizes a surface's hydrophobicity.
An Amott-Harvey index less than -0.3 corresponds to a large value for this dimensionless quantity.
contact angle [or wetting angle; accept wettability until "cosine" is read, and prompt on it afterwards; prompt on angle]