Physical quantities from which all other physical quantities can be derived are known as
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A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement.[1] A physical quantity can be expressed as the combination of a magnitude expressed by a number – usually a real number – and a unit: {\textstyle nu} where {\textstyle n} is the magnitude and {\textstyle u} is the unit. For example, 1.6749275×10−27 kg(the mass of the neutron), or 299792458 metres per second (the speed of light). The same physical quantity {\textstyle x} can be represented equivalently in many unit systems, i.e. {\textstyle x=n_{1}u_{1}=n_{2}u_{2}}.
A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement.[1] A physical quantity can be expressed as the combination of a magnitude expressed by a number – usually a real number – and a unit: {\textstyle nu} where {\textstyle n} is the magnitude and {\textstyle u} is the unit. For example, 1.6749275×10−27 kg(the mass of the neutron), or 299792458 metres per second (the speed of light). The same physical quantity {\textstyle x} can be represented equivalently in many unit systems, i.e. {\textstyle x=n_{1}u_{1}=n_{2}u_{2}}.
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