Centre of mass coordinate system.
A frame attached with the centre of mass of an isolated system of particles is called at the centre of mass coordinate system or C-system.
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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