# Formula Symbols - N

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

## Formula Symbols

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## N

SymbolGreek SymbolDefinitionUSMetricValue
$$ln$$ - natural logarithm - -  -
$$T_n$$ - Neel temperature - -  -
$$F_n$$ - net force $$lbf$$ $$N$$  -
$$NPSH$$ - net positive suction head - -  -
$$NPSH_a$$ - net positive suction head available - -  -
$$E_v$$ - neutron energy constant constant $$3.8280\;x\;10^{-19}\;kg\;m^2\;/\;s^2$$
$$m_n$$ - neutron mass constant constant $$1.674\;927\;498\;04\;x\;10^{-27}\;kg$$
$$NPSH_r$$ - net positive suction head required - -  -
$$\tau_n$$ tau net torque $$lbf-ft$$ $$N-m$$ -
$$n.a.$$ - neutral axis (axis connecting beam cross-section centroids) - -  -
$$T_n$$ - neutral particle temperature - -  -
$$N$$ - neutron number - -  -
$$N$$ - normality - $$GEW\;/\;L$$  -
$$Q_i$$ - normal coordinates - -  -
$$F_n$$ - normal force $$lbf$$ $$N$$  -
$$P_n$$ - normal load strength capacity for LRFD design $$lb \;or\; kip$$ $$N \;or\; kN$$  -
$$V_n$$ - normal shear strength capacity for LRFD beam design $$lb \;or\; kip$$ $$N \;or\; kN$$  -
$$\sigma$$ sigma normal stress $$lbf\;/\;in^2$$ $$Pa$$  -
$$\sigma_{\theta}$$ sigma normal stress in any oblique plane $$lbf\;/\;in^2$$ $$Pa$$  -
$$\mu_n$$ mu nuclear magneton constant constant $$5.050\;783\;7461\;x\;10^{-27}\;J\;T^{-1}$$
$$m_n$$ - nuclear mass - -  -
$$I$$, $$\;J$$ - nuclear spin - -  -
$$A$$ - nucleon number - -  -
$$N$$, $$\;n$$, $$\;x$$ - number - -  -
$$n$$ - number density $$ft^3$$ $$m^3$$  -
$$n$$, $$n_a$$ - number of active coils - - -
$$n$$ - number of air changes - - -
$$N_c$$ - number of coils - -  -
$$N_c$$ - number of cycles - -  -
$$n$$ - number of data points in data set number - - -
$$N$$ - number of data sets - - -
$$N$$ - number of elements - -  -
$$N$$ - number of molecules - -  -
$$n$$ - number of moles - -  -
$$N$$ - number of particles - -  -
$$P$$ - number of phases - -  -
$$N$$ - number of power strokes per minute $$min^{-1}$$ -  -
$$N_t$$, $$\;n$$ - number of teeth - -  -
$$n_t$$ - number of total coils - - -
$$n$$ - number of trust joints, nails or bolts - -  -
$$N$$ - number of turns or revolutions - - -
$$Nu$$ - Nusselt number Dimensionless Dimensionless  -
$$G$$ - Newtonian constant of gravitation constant constant $$6.674\;30\;x\;10^{-11}\;m^3 kg^{-1} s^{-2}$$
$$N$$ - Nyquist"s number - -  -
Symbol Greek Symbol Definition US Metric Value

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