what is significance of sign convection?
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Explanation: in physics, a sign convention is a choice of the physical significance of signs(plus or minus) for a set of quantities, in a case where the choice of sign is arbitrary. "arbitrary" means that the same physical system can be correctly described using different choices for the signs, as long as one set of definitions is used consistently. disagreement about sign convention is a frequent source of confusions, misunderstanding, and even frustrations. in general, a sign convention is a special case of choice of coordinate system for the case of one dimension.
sometimes, the term "sign convention" is used more broadly to include factors of i and 2π, rather than just choices of signs.
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Answer:
CONVECTION - It is the movement of particles/atom of a fluid due to the heat transfer to he the bottom particle/atom .
In simple language when we heat a container filled with liquid its bottom layer get heated and goes upper and upper layer comes down.