What is meant by the measurement of a physical quantity? State how the numerical value of a physical quantity is related to the size of the unit. Write the essential requirements that a physical unit/standard must meet.
Answers
Answer:
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Explanation:
Measurement is a quantitative description of one or more fundamental properties compared to a standard.
measurement of quantity is mentioned in two parts , the first part gives how many times the standard unit and second part gives, the name if the unit e. g 5m.
For any measurement , a number and unit is required. When we say that the time is 5 second then we meant that the said time is 5 times a certain standard time called second.
The essential requirement that a physical unit must meet are
1. It should be well defined without any doubt or ambiguity
2. It should be suitable size. I. e either too long nor too small in comparison with quantity to be measured
3. It should be easily available.
4. It should be non-destructible.
5. It should not change with time.
6. It should not change with place.
7. It should be easily reproducible.