Discussion
Which is the property that does NOT affect nucleate boiling?
Answer: C
The shape of the heating surface is the property that does not affect nucleate boiling in the key. Nucleate boiling depends on the heating surface material and its roughness (which decides the nucleation sites), the liquid properties, the pressure and the agitation. The first two and the last are factors named in the key as affecting it, so the third option, shape of the heating surface, is the one that does not.
In nucleate boiling the number of active bubble sites and the rate of bubble growth set the heat flux, which is why surface roughness, liquid properties and pressure matter, in the key's view, more than the geometry of the surface.
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