Question

what are the advantages of estimating the size or magnitude of a physical quantity before it is measured​

Answer 1

Answer:

magnitude of a physical quantity and units are inversely proportional to each other. Larger the unit, smaller will be the magnitude. (2) Scalar (magnitude only) : These quantities do not have any direction e.g. Length, time, work, energy etc. Magnitude of a physical quantity can be negative.

Answer 2

Physical quantity estimation

Explanation:

• It is wise to estimate the result of a calculation before “crunching” the exact numbers. Doing so yields the “ballpark” value so you will detect a grossly incorrect answer. It also lets you know whether the effect or value you are seeking is significant to the problem.

• This practice began when most calculations were done on the slide rule. Since this device gives the numerical value but not the order of magnitude, these initial rough estimates overcame that limitation. Still, for the reasons enumerated above, the initial estimate is still a smart way to avoid an absurd result due to a calculation error.

• It is very important to estimate the size or magnitude of a physical quantity before it is measured. It gives you an idea about the scale to use to make an accurate measurement.

• Suppose you want to measure the length and breadth of your room. First, estimate the order- will it be in centimeter or meter or kilometer, etc. This makes the measurement process fast.