order of a group.
The number of elements in a finite group is called the order of the group.
It is denoted by O(G) ,G stands for group
If (G,*) is an infinite group, then it is called to be of infinite order.
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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