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What is difference between a physical quantity and a number?

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A physical quantity is a number of object(s) that are tangible objects. A number doesn't have to represent any specific quantity of items, but rather just a quantity in an equation.

Phsyical quantity: 5 chairs, 2 apples

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A physical quantity is always measured of natural non-living objects (Inanimate objects) whereas a number is always displayed with the corresponding digit (1-9)
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What is the difference between derived quantities and fundamental quantities?

In the SI system , there are two categories of unit: the Base Unit and the Derived Unit . There is no such category as 'fundamental unit'. There are seven Base Units.

The differences between scalar quantities and vector quantities?

A scalar quantity is just a number e.g. 3 miles A vector quantity is a number with directions e.g. 3 miles south So the difference between them is that vector has a particular

What is difference between base quantity and derived quantity?

Base quantities (Scalar Quantities) : Independent quantities who have single standard units. - time /seconds -distance/meters Derived Quantities (Vector Quantities): Qua

Why do you have different units for same physical quantity?

There are several reasons. Measurement units evolved over time. People used different units across countries over time. Even now, you have the Imperial system that has been m