1. Measuring is to compare a physical quantity of an object with similar quantity used as a unit.
2. A standard measurement is an agreed unit of measurement with fixed value.
3. The measuring system used in the world is the International System (SI). The SI units can be enlarged or lessened by adding prefixes: kilo (k) meaning 1000 times, hecto (h) meaning 100 times, deca (da) meaning 10 times, deci (d) meaning 1/10 times, centi (c) meaning 1/100 times, milli (m) meaning 1/1000 times and micro (μ) meaning1/1000000 times.
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