Formula Symbols - R

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

SymbolGreek SymbolDefinitionUSMetric
\( r\) - 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 \(in\) \(mm\)
\(R\) - resistance \(ohm\) \(ohm\)
\(\Omega\) omega resistance \(ohm\) \(ohm\)
\(R\) - resultant force \(lbf\) \(N\)
\(Re\) - Reynolds number dimensionless number dimensionless number
\(Ri\) - 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 \(rpm\) \(rpm\)