what are physical balance, beam balance and grocer's balance
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https://www.meritnation.com/ask-answer/question/what-is-the-difference-between-physical-balance-and-beam-bal/measurement/7667435
Refer to the link given below to get the answer of the Ist and IInd question :
https://www.meritnation.com/ask-answer/question/what-is-the-difference-between-physical-balance-and-beam-bal/measurement/7667435