what is Order of differential equation ?

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Answer:-
Order of a differential equation is the order of the highest order derivative occurs in the equation.

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angle of contact.

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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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what do we mean by electrophoresis & electroosmosis?

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Difference between electrochemical & electrolytic cell

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