Question

What is the utility of using unit in a physical quantity explain with examples

Answer 1

Answer:

A physical quantity is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as the combination of a magnitude and a unit. For example, the physical quantity mass can be quantified as n kg where n is magnitude and kg is the unit.

Explanation:

In physics, a physical quantity is any physical property that can be quantified, that is, can be measured using numbers. Examples of physical quantities are mass, amount of substance, length, time, temperature, electric current, light intensity, force, velocity, density, and many others.

Why do physical quantities need units? ... It comes from the very nature of physical quantities: they are measured. Measurement is a comparison with a reference quantity. If I say: “This table is 4.5 meters long” it means that I can get a unit meter and make a ratio between the length of the table and the reference length.

Answer 2

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A physical quantity is any physicalproperty that can be quantified, that is, be measured using numbers. Examples ofphysical quantities are mass, amount of substance, length, time, temperature, electric current, light intensity, force, velocity, density, and many others.

Units are standards for expressing and comparing the measurement of physical quantities. All units can be expressed as combinations of four fundamental units.