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Units And Measurement

Question

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Comment on the statement: Dimensional formula deals with the qualitative nature of physical quantity.

Solution

For a physical quantity, the measure value is given by,
nu,
where, n is the quantitative part and u is qualitative part.
The dimensional formula deals with u part only.
For example, if dimensional formula of physical quantity is [M^aL^bT^c],
the value of u in SI system is kg^am^bs^c

and in cgs system it is gm^acm^bs^e.

Some More Questions From Units and Measurement Chapter

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

How many fundamental quantities are there in mechanics?

How many fundamental quantities are there in Physics?

Name the fundamental quantities of mechanics.

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