# Formula Symbols - M

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

SymbolGreek SymbolDefinitionUSMetric
$$m_e$$ - electron (rest) $$lbm$$ $$kg$$
$$M$$ - Mach number dimensionless number dimensionless number
$$Ma$$ - Mach number dimensionless number dimensionless number
$$V$$ - Manning formula $$ft/sec$$ $$m/s$$
$$Ma$$ - Marangoni number dimensionless number dimensionless number
$$m$$ - mass $$lbm$$ $$kg$$
$$\dot {m}_c$$ - mass condensation rate $$lbm/hr$$ $$kg/s$$
$$\rho$$ rho mass density - $$kg/m^3$$
$$D_m$$ - mass diffusivity - $$cm^2/s$$
$$\dot {m}_f$$ - mass flow rate $$lbm/sec$$ $$kg/s$$
$$\Gamma$$ Gamma mass flow rate per unit area $$lbm/hr-ft^2$$ $$kg/s \cdot m^2$$
$$I$$ - mass moments of inertia $$lbm-ft^2$$ $$kg \cdot m^2$$
$$K$$ - mass transfer coefficient - -
$$\dot {m}_t$$ - mass transfer rate $$lbm/sec$$ $$kg/s$$
$$D$$ - material density $$g / cm^3$$ $$kg / m^3$$
$$m$$ - mean - -
$$\lambda$$ lambda mean free path - -
$$v_m$$ - mean velocity $$ft/sec$$ $$m/s$$
$$ME$$ - mechanical energy - -
$$W$$ - mechanical work - $$J$$
$$K$$ - mixing factor - -
$$E$$ - modulus of elasticity $$lbf/ft^2$$ $$Pa$$
$$\lambda$$ lambda modulus of elasticity - -
$$n$$ - modular ratio - -
$$m$$ - module - $$mm$$
$$m$$ - molality - $$mol/1000g$$
$$M$$ - molar concentration $$lbmol/ft^3$$ $$kmol/m^3$$
$$H$$ - molar enthalpy $$Btu/lbmol$$ $$kJ/kmol$$
$$S$$ - molar entropy $$Btu/lbmol- ^\circ {R}$$ $$kJ/kmol \cdot K$$
$$R$$ - molar gas constant $$ft-lbf/lbmol-^\circ R$$ $$J/kmol\cdot K$$
$$Q$$ - molar heat $$Btu/lbmol$$ $$kJ/kmol$$
$$U$$ - molar internal energy $$Btu/lbmol$$ $$kJ/kmol$$
$$M$$ - molar mass of gas - -
$$C$$ - molar specific heat $$Btu/lbmol- ^\circ {F}$$ $$kJ/kmol \cdot {K}$$
$$M$$ - molarity - $$mol/l$$
$$\chi$$ chi mole fraction - -
$$M$$ - moment $$ft-lbf$$ $$N \cdot m$$
$$M$$ - moment of force $$ft-lbf$$ $$N \cdot m$$
$$I$$ - moment of inertia - $$kg \cdot m^2$$
$$p$$ - momentum $$lbm-ft/sec$$ $$kg \cdot m/s$$
$$MC$$ - moisture content - -
$$MW$$ - molecular weight $$lbm/lbmol$$ $$kg/kmol$$
$$Mo$$ - Morton number dimensionless number dimensionless number