Steric hindrance.
Answer:-
This effect was thought to be spatial effect brought into play by mechanistic interference between groups and is known as steric hindrance.Steric hindrance arises due to the geometry of the reactant molecule.
angle of contact.
It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact The value of angle of contact depends upon (i) Nature of solid and liquid in contact (ii) Cleanliness of the surface in contact (iii) Medium above the free surface of liquid
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