Formula Symbols - S

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
$$S$$ - sag $$ft$$ $$m$$
$$e_s$$ - saturated vapor pressure $$lbf \;/\; /ft^2$$ $$Pa$$
$$\vartheta \;,\; \theta$$ vartheta , theta scattering angle - -
$$Sc$$ - Schmidt number dimensionless number dimensionless number
$$SEER$$ - seasonable energy efficiency ratio $$kW-hr\;/\;Btu$$ -
$$I$$ - second moment of area $$in^4$$ $$mm^4$$
$$S$$ - section modulus

$$in^3$$

$$mm^3$$
$$S_{required}$$  - section modulus required not to exceed allowable bending stress $$in^3$$  $$mm^3$$
$$S_x$$  - section modulus with the respect to the x-centroidal axis $$in^3$$  $$mm^3$$
$$S_y$$  - section modulus with the respect to the y-centroidal axis $$in^3$$  $$mm^3$$
$$v_s$$ - seepage velocity - -
$$\delta$$ delta semivertex angle $$\deg$$ $$\deg$$
$$B$$ - separation distance $$ft$$ $$m$$
$$SF$$ - service factor - -
$$SC$$ - shading coefficient - -
$$F_s$$ - shading factor - -
$$H$$ - shape factor dimensionless number dimensionless number
$$J$$ - shear compliance - -
$$q$$ - shear Flow $$lbf\;/\;in\;,\; kips\;/\;ft$$ $$N\;/\;m\;,\; kN\;/\;m$$
$$J"$$ - shear loss compliance - -
$$G"$$ - shear loss modulus - -
$$G \;,\; \mu$$ mu shear modulus $$lbf\;/\;in^2$$ $$Pa$$
$$\dot {\gamma}$$ gamma shear rate - -
$$J'$$ - shear storage compliance - -
$$G'$$ - sheat storage modulus - -
$$\delta_s$$ delta shear deformation $$in$$ $$mm$$
$$V$$ - shear force $$lb \;,\; kip$$ $$N \;,\; kN$$
$$\gamma$$ gamma shear strain $$rad$$ $$rad$$
$$\tau$$ tau shear stress $$lbf\;/\;ft^2$$ $$Pa$$
$$\tau_{\theta}$$ tau shear stress in any oblique plane $$lbf\;/\;ft^2$$ $$Pa$$
$$\sigma$$ sigma sheat tension - -
$$Sh$$ - Sherwood number dimensionless number dimensionless number
$$\theta$$ theta shock semivertex angle $$\deg$$ $$\deg$$
$$\sigma$$ sigma short range order parameter - -
$$s$$ - side length $$ft$$ $$m$$
$$\mu$$ mu simple viscosity $$lbf-sec\;/\;ft^2$$ $$Pa\cdot s$$
$$G$$ - slipping - -
$$m$$ - slope $$ft$$ $$m$$
$$\phi$$ phi slope of the deflection of a beam at a point degrees radians
$$\eta_s$$ eta slurry viscosity - -
$$SCL$$ - solar cooling load factor $$Btu\;/\;hr-ft^2$$ $$W\;/\;m^2$$
$$\Omega \;,\; \omega$$ Omega , omega solid angle $$deg$$ $$rad$$
$$S$$ - Sommerfield number dimensionless number dimensionless number
$$a$$ - sound $$ft\;/\;sec$$ $$m\;/\;s$$
$$W$$ - sound energy flux - -
$$L_w$$ - sound power level - -
$$u$$ - sound particle velocity - -
$$L_p$$ - sound pressure level - -
$$L$$ - span length under consideration $$in \;,\; ft$$ $$mm \;,\; m$$
$$U$$ - specific cutting energy $$lbf-ft \;/\; ft^3$$ $$J \;/\; m^3$$
$$h$$ - specific enthalpy $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$
$$R$$ - specific gas constant $$lbf-ft\;/\;lbm- R$$ $$kJ\;/\;kg \cdot K$$
$$SG$$ - specific gravity dimensionless number dimensionless number
$$c$$ - specific heat $$Btu\;/\;lbm- F$$ $$kJ\;/\;kg \cdot C$$
$$Q \;,\; c_p$$ - specific heat capacity $$Btu\;/\;lbm- F$$ $$kJ\;/\;kg \cdot C$$
$$C_p$$ - specific heat constant pressure - -
$$C_v$$ - specific heat constant volume - -
$$\gamma \;,\; \kappa$$ gamma , kappa specific heat ratio dimensionless number dimensionless number
$$F_k$$ - specific heat ratio factor - -
$$I_{sp}$$ - specific impulse $$sec$$ $$s$$
$$u$$ - specific internal energy $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$
$$\eta_{sp}$$ eta specific viscosity - -
$$v \;,\; \upsilon$$ upsilon specific volume $$ft^3\;/\;lbm$$ $$m^3\;/\;kg$$
$$\gamma$$ gamma specific weight $$lbf\;/\;ft^3$$ -
$$w_\lambda$$ - spectral concentration of radiant energy density - -
$$I_v$$ - spectral concentration of radiant intensity - -
$$K$$ - spectral luminous efficacy - -
$$V$$ - spectral luminous efficiency - -
$$L$$ - self-inductance - -
$$u \;,\; v$$ - speed $$ft\;/\;sec$$ $$m\;/\;s$$
$$c$$ - speed of light $$ft\;/\;sec$$ $$m\;/\;s$$
$$c$$ - speed of light in vacuum constant constant
$$a$$ - speed of sound $$ft\;/\;sec$$ $$m\;/\;s$$
$$S \;,\; s_i$$ - spin - -
$$k_s$$ - spring constant $$lbf$$ $$N$$
$$d_s$$ - spring displacement $$in$$ $$mm$$
$$E_s$$ - spring energy $$in-lbf$$ $$J$$
$$F_s$$ - spring force $$lbf$$ N
$$p_s$$ - stagnation pressure - -
$$St$$ - Stanton number dimensionless number dimensionless number
$$SE$$ - static efficiency - -
$$f_s$$ - static friction $$lbf$$ $$N$$
$$\mu_s$$ mu static friction coefficient dimensionless number dimensionless number
$$h_s$$ - static head $$ft$$ $$m$$
$$SP$$ - static pressure $$in\;wg$$ $$Pa$$
$$\Psi$$ Psi steam function - -
$$\Phi$$ Phi steam potential - -
$$Ste$$ - Stefan number dimensionless number dimensionless number
$$\sigma$$ sigma Stefan-Boltzmann constant - -
$$St$$ - Stokes' Law - -
$$\epsilon$$ epsilon strain $$in\;/\;in$$ $$m\;/\;mdeg$$
$$\epsilon_o$$ epsilon strain amplitude - -
$$U$$ - strain energy $$lbf-in\;/\;in^3$$ $$J\;/\;m^3$$
$$S$$ - strength $$lbf\;/\;in^2$$ $$Pa$$
$$K$$ - strength coefficient $$lbf\;/\;in^2$$ $$MPa$$
$$k$$ - strength derating factor - -
$$S \;,\; \sigma$$ sigma stress $$in\;/\;in$$ $$m\;/\;mdeg$$
$$L$$ - stroke $$ft$$ $$m$$
$$L$$ - stroke length $$ft$$ $$m$$
$$S$$ - strength $$lbf\;/\;in^2$$ $$Pa$$
$$Sr$$ - Strouhal number dimensionless number dimensionless number
$$N$$ - Stuart number dimensionless number dimensionless number
$$SA$$ - suction specific speed available $$rpm$$ $$rpm$$
$$S$$ - surface area $$ft^2$$ $$m^2$$
$$\sigma$$ sigma surface change density - -
$$H_c$$ - superconductor critical field strength - -
$$T_c$$ - superconductor critical transition temperature - -
$$\Delta$$ Delta superconductor energy gap - -
$$\gamma \;,\; \sigma$$ gamma , sigma surface tension $$lbf\;/\;ft$$ $$N\;/\;m$$
$$B$$ - susceptance - -
$$S$$ - Summerfeld number - -
$$\Sigma$$ Sigma summation - -
$$S4S$$ - surface 4 sided - -
$$s$$ - symmetry number - -