Physical quantity

A physical quantity is a property of a material that can be quantified by measurement. A physical quantity can be expressed as the combination of unit by a number. where the number is the magnitude . For example, 1 kg where 1 is magnitude and kg is unit.No common symbol for n-space density, here ρn is used. (length, area, volume or higher dimensions) q = ∫ q λ d λ {displaystyle q=int q_{lambda }mathrm {d} lambda } q = ∫ q ν d ν {displaystyle q=int q_{ u }mathrm {d} u } T (qν)Transport mechanics, nuclear physics/particle physics: q = ∭ F d A d t {displaystyle q=iiint Fmathrm {d} Amathrm {d} t} section / surface boundaryq is a scalar: m = r q {displaystyle mathbf {m} =mathbf {r} q} q is a vector: m = r × q {displaystyle mathbf {m} =mathbf {r} imes mathbf {q} } A physical quantity is a property of a material that can be quantified by measurement. A physical quantity can be expressed as the combination of unit by a number. where the number is the magnitude . For example, 1 kg where 1 is magnitude and kg is unit. Symbols for quantities should be chosen according to the international recommendations of ISO/IEC 80000, the IUPAP red book and the IUPAC green book. For example, the recommended symbol for the physical quantity mass is m, and the recommended symbol for the quantity charge is Q.