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Exercise 1

All areas of measurement have been decimalized, that is, based on a scale of 10, except for the measure of time. Why do we not have 10 hours in a day, 10 minutes in an hour, and ten seconds in a minute?         Check
Exercise 2

Not all SI (metric) units have been adopted universally for all measures. For example, in the automotive trades, there are informal units such as thous and clicks, and other traditional units such as psi s. Similarly, we still use units called knots and kilowatt hours. What are these, and why are they used?
Exercise 3

What is the difference between accuracy and precision in measurement? Can we, in fact, measure exactly, or is an estimate the best we can do, even with the best possible measuring instruments?         Check
Exercise 4

Find out how measuring instruments are calibrated. Was it always like this?
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Exercises
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Largely historical reasons – the influence of the Babylonians.


In common language there appears to be little difference. However, it is considered by some authorities that accuracy has to do with how close you come to the actual measure (as when comparing an estimate to the ‘actual’), while precision has to do with using finer graduations, smaller units, and more refined methods of measuring.