Longest lengths are measured through measuring tape, then goes the ruler scale and then the vernier caliper and screw gauge for small to minute as well as accurate measurement.
However, physical measurement involves error and every physical measurement is an approximation.
Accuracy and Precision
The most meaningful way of interpreting a measurement is as an interval with a lower bound and an upper bound. Imagine that we have measured a line segment, using a ruler divided into centimeters, and found the length to be 5 cm.
To be more precise, we can state the measure as an interval -- either in words, 5 cm to the nearest 0.5 cm, or using notation, such as 5 cm±0.5 cm (5± 0.5 implies a lower bound of 4.5 and an upper bound of 5.5). We can also state that the maximum possible error for this measure is 0.5 cm.the precision of a measurement depends on the size of the smallest measuring unit.. The smaller the interval, the more we have "narrowed it down," and thus the more precise the measurement.
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