Question

what is unknown physical quantity?give 3 eg​

Answer 1

Answer:

A physical quantity is any phenomenon that can be measured with an instrument or be calculated for. A physical quantity can be expressed as a value, which is the algebraic multiplication of a numerical value and a unit. For example, the physical quantity mass can be quantified as n kg, where n is the numerical value and kg is the unit.

Answer 2

Answer:

Scientists know many physical quantities, which are classified into basic and derived. Basic quantities are undefined (unknown), while the derived quantities are defined in terms of the basic. The basic quantities are length, time, mass, charge, temperature, and the amount of substance.

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