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

See Dimensionless Numbers, General Constants

SymbolGreek SymbolDefinitionUSMetric
\(S\) - sag \(ft\) \(m\)
\(e_s\) - saturated vapor pressure - -
\(\vartheta \;,\; \theta\) 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 \(lbf-ft\;/\;lbm-^\circ R\) \(kJ\;/\;kg \cdot K\)
\(SG\) - specific gravity dimensionless number dimensionless number
\(c\) - specific heat \(Btu\;/\;lbm-^\circ F\) \(kJ\;/\;kg \cdot ^\circ C\)
\(Q \;,\; c_p\) - specific heat capacity \(Btu\;/\;lbm-^\circ F\) \(kJ\;/\;kg \cdot ^\circ C\)
\(C_p\) - 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 \(lbf\;/\;ft\) \(N\;/\;m\)
\(d_s\) - spring displacement - -
\(F_s\) - spring force - -
\(p_s\) - stagnation pressure - -
\(St\) - Stanton number dimensionless number dimensionless number
\(SE\) - static efficiency - -
\(f_s\) - static friction - -
\(\mu_s\) mu static friction coefficient dimensionless number dimensionless number
\(SP\) - 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 - -