Gram molecular weight.
Answer:-
It is the molecular weight of a substance expressed in grams or it is the weight in grams which is numerically equal to its molecular weight.It is also called gram molecule or simply one mole of a substance.
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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