# Formula Symbols - U

Written by Jerry Ratzlaff on . Posted in Nomenclature & Symbols for Engineering, Mathematics, and Science

## Formula Symbols

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# U

SymbolGreek SymbolDefinitionEnglishMetricSIValue
$$UTS$$ - ultimate tensile stress $$\large{ \frac{lbf}{in^2} }$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$ -
$$l_{ur}$$ - unrestrained pipe length $$ft$$ or $$in$$ $$m$$ or $$mm$$ $$m$$ or $$mm$$  -
$$K_1$$ - upstream resistance coefficient dimensionless -
$$L_b$$ - unbraced length of a steal beam in LRFD design $$ft$$ or $$in$$ $$m$$ or $$mm$$  $$m$$ or $$mm$$ -
$$p_u$$ - underwater pressure $$\large{ \frac{lbf}{in^2} }$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$ -
$$\gamma$$ gamma unit weight $$\large{ \frac{lbm}{ft^3} }$$ $$\large{ \frac{N}{m^3} }$$ $$N-m^{-3}$$ -
$$\gamma_s$$ gamma unit weight of solid $$\large{ \frac{lbm}{ft^3} }$$ $$\large{ \frac{N}{m^3} }$$ $$N-m^{-3}$$ -
$$\gamma_w$$ gamma unit weight of water $$\large{ \frac{lbm}{ft^3} }$$ $$\large{ \frac{N}{m^3} }$$ $$N-m^{-3}$$ -
$$R$$, $$\;R*$$ - universal gas constant $$\large{ \frac{lbf-ft}{lbmol-R} }$$ $$\large{ \frac{J}{kmol-K} }$$ $$J-kmol-K^{-1}$$   $$8.314\;462\;618\;153\;24$$ $$\large{ \frac{J}{kmol-K} }$$
$$G$$ - universal gravitational constant $$\large{\frac{lbf-ft^2}{lbm^2}}$$  $$\large{\frac{N - m^2}{kg^2}}$$ $$N - m^2-kg^{-2}$$  $$6.674\;30\;x\;10^{-11}$$ $$\large{\frac{N - m^2}{kg^2}}$$
$$USLE$$ - universal soil loss $$tons-acre-yr$$ $$tonnes-hectare-yr$$ $$tonnes-hectare-yr$$ -
$$l_{ur}$$ - unrestrained pipe expansion $$ft$$ $$m$$ $$m$$  -
$$U$$ - Ursell number dimensionless -
Symbol Greek Symbol Definition English Metric   Value

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