Formula Symbols - R

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

For other symbols see:  A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

SymbolGreek SymbolDefinitionUSMetric
\(Q_e\) - radiant energy - -
\(Q_r\) - radiant heat - -
\( r\) - radius \(in\;\)or\(\;ft\) \(m\)
\( k\) - radius of gyration \(ft\) \(m\)
\( r\) - ratio - -
\( k\) - ratio of specific heat - -
\(Ra\) - Rayleigh number dimensionless number dimensionless number
\(R\) - reaction force \(lbf\) \(N\)
\(p_r\) - reduced pressure - -
\(\upsilon_r\) upsilon reduced specific volume - -
\(T_r\) - reduced temperature - -
\(x\) - relative abundance - -
\(RD\) - relative density dimensionless number dimensionless number
\(\phi \) phi relative humidity - -
\(k\) - relative roughness \(in\) \(mm\)
\(E_r\) - relativistic energy - -
\(m_r\) - relativistic mass - -
\(p\) - relativistic momentum - -
\(R\) - resistance \(ohm\) \(ohm\)
\(\Omega\) omega resistance \(ohm\) \(ohm\)
\(R\) - resultant force \(lbf\) \(N\)
\(Re\) - Reynolds number dimensionless number dimensionless number
\(F_R\) - Reynolds number factor - -
\(Ri\) - Richardson number dimensionless number dimensionless number
\(C_{rr}\) - rolling resistance dimensionless number dimensionless number
\(Ro\) - Roshko number dimensionless number dimensionless number
\(Ro\) - Rossby number dimensionless number dimensionless number
\(n\) - rotational speed \(rpm\) \(rpm\)