# Formula Symbols - O

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

## Formula Symbols

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## O

SymbolGreek SymbolDefinitionEnglishMetricSIValue
$$\rho_o$$ rho object density $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$ $$kg-m^{-3}$$ -
$$ON$$ - octane number dimensionless -
$$x$$ - offset distance $$ft$$ $$m$$ $$m$$ -
$$T$$ - offset motion - - - -
$$R$$ - ohm - - - -
$$Oh$$ - Ohnesorge number dimensionless -
$$\Omega$$ omega ohm - - - -
- - Ohm's law - - - -
$$1D$$ - one-dimension - - - -
$$L$$, $$\;l_i$$ - orbital angular momentum - - - -
$$n$$ - order of reflexion - - - -
$$A_o$$ - orifice area $$in^2$$ $$mm^2$$ $$mm^2$$ -
$$h$$ - orifice center of head $$in$$ $$mm$$ $$mm$$ -
$$K$$ - orifice constant $$gpm-\sqrt{psi}$$ $$\large{\frac{L}{s \sqrt{kPa}}}$$ - -
$$C_d$$ - orifice discharge coefficient dimensionless -
$$Q$$ - orifice flow rate $$\large{\frac{ft^3}{sec}}$$ $$\large{\frac{m^3}{s}}$$ $$m^3-s^{-1}$$ -
$$G$$ - orifice gravitational constant $$\large{\frac{lbf-ft^2}{lbm^2}}$$  $$\large{\frac{N - m^2}{kg^2}}$$  $$N-m^2-kg^{-2}$$ -
$$l_o$$ - origional length $$ft$$ or $$m$$ $$in$$ or $$mm$$ $$in$$ or $$mm$$ -
$$f_o$$ - orthogonal force $$lbf$$ $$N$$ $$kg-m-s^{-2}$$ -
$$\pi$$ pi osmotic pressure $$\large{\frac{lbf}{ft^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$ -
$$p_o$$ - outlet pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$ -
$$E_o$$ - output energy $$lbf-ft$$ $$J$$ $$kg-m^2-s^{-2}$$ -
$$W_o$$ - output work $$lbf-ft$$ $$J$$ $$kg-m^2-s^{-2}$$ -
$$OD$$ - outside diameter $$in$$ $$mm$$ $$mm$$ -
$$OD$$ - outside diameter of pipe $$in$$ $$mm$$ $$mm$$ -
$$U$$ - overall coefficient of heat transfer - - - -
$$\eta_0$$ eta overall efficiency dimensionless -
$$U$$ - overall heat transfer coefficient $$\large{\frac{Btu}{hr-ft^2-F}}$$  $$\large{\frac{W}{m^2-K}}$$ $$W-m^{-2}-K^{-1}$$ -
Symbol Greek Symbol Definition English Metric   Value

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