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Answer:
1. the action of measuring something.
2. The seven base quantities and their corresponding units are:
time (second)
length (metre)
mass (kilogram)
electric current (ampere)
thermodynamic temperature (kelvin)
amount of substance (mole)
luminous intensity (candela)
3. The current international standard metric system is the International System of Units (Système international d'unités or SI). It is an mks system based on the metre, kilogram and second as well as the kelvin, ampere, candela, and mole.
4. Here are some examples of non-standard units of length: hand span. thumb width. pace.
5. Standard unit of measurement provides a reference point by which objects of weight, length or capacity can be described. Standard units are the units used all over the world for measuring a particular quantity. The need of a standard unit arises when we deal with people when from other places.
6. The greatest advantage of SI is that it has only one unit for each quantity (type of measurement). This means that it is never necessary to convert from one unit to another (within the system) and there are no conversion factors for students to memorize. For example, the one and only SI unit of length is the meter (m).
7. Following are the important characteristics of standard unit: (i) It should be easily understandable. (ii) It should be changed with change in physical factors. (iii) It should not change with place or time
8. Length, Mass and Time
These three units form the mks-system or the metric system. A meter is a unit of length, currently defined as the distance that light travels in 1/299,792,458 of a second. A kilogram is a unit of mass. ... A second is a unit of time.
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