Question

1. What is meant by measurement ?
2. What do you understand by the term unit ?
3. What are the three requirements for selecting
of a physical quantity ?​

Answer 1

1. Measurement is the assignment of a number to a characteristic of an object or event, which can be compared with other objects or events.
2. A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.
3. Three requirements for selecting a unit of are:

• The unit should be reproducible.
• It should be possible to define the unit without ambiguity.
• The value of the unit should not change with space and time.

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