Formula Symbols - S
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S
| Symbol | Greek Symbol | Definition | US | Metric | Value |
|---|---|---|---|---|---|
| \(S_0/R\) | - | Sackur-Tetrode constant | dimensionless constant | dimensionless constant | \(-1.164\;8708\) |
| \(SF\) | - | safety factor | - | - | - |
| \(S\) | - | sag | \(in\) | \(mm\) | - |
| \(\gamma_{sat}\) | gamma | saturated unit weight | \(lbf\) | \(N\) | - |
| \(e_s\) | - | saturated vapor pressure | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(\vartheta\), \(\;\theta\) | vartheta, theta | scattering angle | - | - | - |
| \(Sc\) | - | Schmidt number | dimensionless | dimensionless | - |
| \(SEER\) | - | seasonable energy efficiency ratio | \(kW-hr\;/\;Btu\) | - | - |
| \(I\) | - | second moment of area | \(in^4\) | \(mm^4\) | - |
| \(c_2\) | - | second radiation constant | constant | constant | \(1.438\;776\;877...\;x\;10^{-2}\;m\;K\) |
| \(S\) | - | 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 | \(in^3\) | \(mm^3\) | - |
| \(w_s\) | - | sediment fall velocity | - | - | - |
| \(v_s\) | - | seepage velocity | - | - | - |
| \(L\) | - | self-inductance | - | - | - |
| \(\delta\) | delta | semivertex angle | \(\deg\) | \(\deg\) | - |
| \(B\) | - | separation distance | \(ft\) | \(m\) | - |
| \(SF\) | - | service factor | - | - | - |
| \(SC\) | - | shading coefficient | - | - | - |
| \(F_s\) | - | shading factor | - | - | - |
| \(d\) | - | shaft deflection | \(in\) | \(mm\) | - |
| \(k\) | - | shape factor | dimensionless | dimensionless | - |
| \(J\) | - | shear compliance | - | - | - |
| \(q\) | - | shear flow | \(lbf\;/\;in\;or\; kips\;/\;ft\) | \(N\;/\;m\;or\; kN\;/\;m\) | - |
| \(J"\) | - | shear loss compliance | - | - | - |
| \(G"\) | - | shear loss modulus | \(Pa\) | \(Pa\) | - |
| \(G\), \(\;\mu\) | mu | shear modulus | \(Pa\) | \(Pa\) | - |
| \(\dot {\gamma}\) | gamma | shear rate | - | - | - |
| \(J'\) | - | shear storage compliance | - | - | - |
| \(G'\) | - | sheat storage modulus | - | - | - |
| \(\delta_s\) | delta | shear deformation | \(in\) | \(mm\) | - |
| \(V\) | - | shear force | \(lb \;,\; kip\) | \(N \;,\; kN\) | - |
| \(G\) | - | shear modulus | \(Pa\) | \(Pa\) | - |
| \(\dot {\gamma}\) | gamma | shear rate | \(1/s \;,\; rad/s\) | \(1/s \;,\; rad/s\) | - |
| \(\gamma\) | gamma | shear strain | \(rad\) | \(rad\) | - |
| \(\tau\) | tau | shear stress | \(lb\;/\;in^2 \;or\; psi\) | \(kg \;/\; cm^2\) | - |
| \(\tau_{butt}\) | tau | sheat stress of weld | \(lb\;/\;in^2 \;or\; psi\) | \(kg \;/\; cm^2\) | - |
| \(\tau_{\theta}\) | tau | shear stress in any oblique plane | \(lbf\;/\;ft^2\) | \(Pa\) | - |
| \(u*\) | - | shear velocity | - | - | - |
| \(\sigma\) | sigma | sheat tension | - | - | - |
| \(Sh\) | - | Sherwood number | dimensionless | dimensionless | - |
| \(\theta\), \(\;\tau_*\) | - | Shields parameter | dimensionless | dimensionless | - |
| \(\theta\) | theta | shock semivertex angle | \(\deg\) | \(\deg\) | - |
| \(\sigma\) | sigma | short range order parameter | - | - | - |
| \(s\) | - | side length | \(ft\) | \(m\) | - |
| \(\mu\) | mu | simple viscosity | \(lbf-sec\;/\;ft^2\) | \(Pa\cdot s\) | - |
| \(C_f\) | - | skin friction coefficient | dimensionless | dimensionless | - |
| \(G\) | - | slipping | - | - | - |
| \(m\) | - | slope | \(ft\) | \(m\) | - |
| \(l\) | - | slope length | \(ft\) | \(m\) | - |
| \(S\) | - | slope steepness | \(ft/sec\) | \(m/sec\) | - |
| \(\phi\) | phi | slope of the deflection of a beam at a point | degrees | radians | - |
| \(\eta_s\) | eta | slurry viscosity | - | - | - |
| \(K\) | - | soil erodibility factor | - | - | - |
| \(SCL\) | - | solar cooling load factor | \(Btu\;/\;hr-ft^2\) | \(W\;/\;m^2\) | - |
| \(\Omega\), \(\;\omega\) | Omega, omega | solid angle | \(deg\) | \(rad\) | - |
| \(S\) | - | Sommerfield number | dimensionless | dimensionless | - |
| \(a\) | - | 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 | \(Btu\;/\;lbm\) | \(kJ\;/\;kg\) | - |
| \(C_d\) | - | specific flow coefficient | - | - | - |
| \(R\) | - | specific gas constant | constant | constant | \(8.3145\;J\;mol^{-1}\;K^{-1}\) |
| \(SG\) | - | specific gravity | dimensionless | dimensionless | - |
| \(SG\), \(\;SG_g\) | - | specific gravity of gas | dimensionless | dimensionless | - |
| \(SG\), \(\;SG_l\) | - | specific gravity of liquid | dimensionless | dimensionless | - |
| \(c\) | - | specific heat | \(Btu\;/\;lb- ^\circ F\) | \(kJ\;/\;kg-K\) | - |
| \(Q\), \(\;c_p\) | - | specific heat capacity | \(Btu\;/\;lb- ^\circ F\) | \(kJ\;/\;kg-K\) | - |
| \(C_p\) | - | specific heat constant pressure | \(ft-lbf\;/\;lb-^\circ F\) | \(J\;/\;kg-K\) | - |
| \(C_v\) | - | specific heat constant volume | \(ft-lbf\;/\;lb-^\circ F\) | \(J\;/\;kg-K\) | - |
| \(c_a\) | - | specific heat of air | \(Btu\;/\;lb- ^\circ F\) | \(J\;/\;kg-K\) | - |
| \(c_l\) | - | specific heat of liquid | \(Btu\;/\;lb- ^\circ F\) | \(J\;/\;kg-K\) | - |
| \(\gamma\), \(\;\kappa\), \(\;k\) | gamma, kappa | specific heat ratio | dimensionless | dimensionless | - |
| \(F_k\) | - | specific heat ratio factor | - | - | - |
| \(I_{sp}\) | - | specific impulse | \(sec\) | \(s\) | - |
| \(u\) | - | specific internal energy | \(Btu\;/\;lbm\) | \(kJ\;/\;kg\) | - |
| \(R_{\lambda}\) | lambda | specific thermal resistance | \(hr-^\circ F\;/\;Btu\) | \(K\;/\;W\) | - |
| \(\eta_{sp}\) | eta | specific viscosity | - | - | - |
| \(v\), \(\;\upsilon\) | upsilon | specific volume | \(ft^3\;/\;lbm\) | \(m^3\;/\;kg\) | - |
| \(\gamma \) | gamma | specific weight | \(lbf\;/\;ft^3\) | \(N\;/\;m^3\) | - |
| \(\gamma_a \) | gamma | specific weight of air | \(lbf\;/\;ft^3\) | \(N\;/\;m^3\) | - |
| \(w_\lambda\) | - | spectral concentration of radiant energy density | - | - | - |
| \(I_v\) | - | spectral concentration of radiant intensity | - | - | - |
| \(K\) | - | spectral luminous efficacy | - | - | - |
| \(V\) | - | spectral luminous efficiency | - | - | - |
| \(u\), \(\;v\) | - | speed | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(s\) | - | speed (rpm) | - | - | - |
| \(c\) | - | speed of light in vacuum | constant | constant | \(299\;792\;458\;x\;m\;/\;s\) |
| \(c\) | - | speed of light wave velocity | constant | constant | \(299\;792\;458\;x\;m\;/\;s\) |
| \(a\) | - | speed of sound | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(S\), \(\;s_i\) | - | spin | - | - | - |
| \(L_c\) | - | spring coil wire length | \(in\) | \(mm\) | - |
| \(k\), \(\;k_s\) | - | spring constant | \(lbf \;/\; ft\) | \(N \;/\; m\) | - |
| \(d_s\) | - | spring displacement | \(in\) | \(mm\) | - |
| \(d_s\) | spring deflection | \(in\) | \(mm\) | - | |
| \(E\), \(\;E_s\) | - | spring energy | \(ft-lbf\) | \(J\) | - |
| \(F_s\) | - | spring force | \(lbf\) | N | - |
| \(k_s\) | - | spring force constant | constant | constant | - |
| \(l_f\) | - | spring free length | \(in\) | \(mm\) | - |
| \(C\) | - | spring index | dimensionless | dimensionless | - |
| \(D_i\) | - | spring inside diameter | \(in\) | \(mm\) | - |
| \(l_i\) | - | spring installed length | \(in\) | \(mm\) | - |
| \(P\) | - | spring load | \(lb\) | \(kg\) | - |
| \(n\), \(\; n_a\) | - | spring number of active coils | - | - | - |
| \(l_o\) | - | spring operating length | \(in\) | \(mm\) | - |
| \(D_o\) | - | spring outside diameter | \(in\) | \(mm\) | - |
| \(p\) | - | spring pitch | \(in\) | \(mm\) | - |
| \(PE_s\) | - | spring potential energy | \(lbf \;/\; ft\) | \(J\) | - |
| \(n_s\) | - | spring rate | \(in\) | \(mm\) | - |
| \(n_t\) | - | spring total number of coils | - | - | - |
| \(L_t\) | - | spring total wire length | \(in\) | \(mm\) | - |
| \(G\) | - | spring shear modulus of material | \(Pa\) | \(Pa\) | - |
| \(\tau\) | tau | spring shear stress | \(lb\;/\;in^2 \;or\; psi\) | \(kg \;/\; cm^2\) | - |
| \(l_s\) | - | spring solid length or shut length | \(in\) | \(mm\) | - |
| \(C_s\) | - | spring space between coils | \(in\) | \(mm\) | - |
| \(d\) | - | spring wire diameter | \(in\) | \(mm\) | - |
| \(S\), \(\;\sigma\) | - | spring wire stress | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(p_s\) | - | stagnation pressure | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(R*\) | - | standard atmosphere | constant | constant | \(101\;325\;Pa\) |
| \(g\) | - | standard gravity | constant | constant | \(9.806\;65\;m\;s^{-2}\) |
| \(g\) | - | standard gravity acceleration | constant | constant | \(9.806\;65\;m\;s^{-2}\) |
| \(St\) | - | Stanton number | dimensionless | dimensionless | - |
| \(h_{sd}\) | - | static discharge head | \(ft\) | \(m\) | - |
| \(SE\) | - | static efficiency | - | - | - |
| \(f_s\) | - | static friction | \(lbf\) | \(N\) | - |
| \(\mu_s\) | mu | static friction coefficient | dimensionless | dimensionless | - |
| \(h_s\) | - | static head | \(ft\) | \(m\) | - |
| \(SP\) | - | static pressure | \(in\;wg\) | \(Pa\) | - |
| \(h_{ss}\) | - | static suction head | \(ft\) | \(m\) | - |
| \(\rho_s\) | rho | steam density | \(lb \;/\; ft^3\) | \(kg \;/\; m^3\) | - |
| \(Q_s\) | - | steam flow rate | \(ft^3 \;/\; sec\) | \(m^3 \;/\; s\) | - |
| \(\Psi \) | Psi | steam function | - | - | - |
| \(L\), \(\;L_s\) | - | steam latent heat | \(Btu \;/\; lbm\) | \(J \;/\; kg\) | - |
| \(\Phi \) | Phi | steam potential | - | - | - |
| \(v_s\) | - | steam velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(Ste\) | - | Stefan number | dimensionless | dimensionless | - |
| \(\sigma\) | sigma | Stefan-Boltzmann constant | constant | constant | \(5.670\;374\;419...\;x\;10^{-8}\;W\;m^{-2}\;K^{-4}\) |
| - | - | Stefan-Boltzmann law | - | - | - |
| \(k\) | - | stiffness | \(lbf\;/\;ft\) | \(N\;/\;m\) | - |
| \(St\) | - | Stokes' law | - | - | - |
| \(Stk\), \(\;S_k\) | - | Stokes number | dimensionless | dimensionless | - |
| \(\epsilon \) | epsilon | strain | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(\epsilon_o\) | 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 | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(L\) | - | stroke | \(in\) | \(mm\) | - |
| \(L\) | - | stroke length | \(in\) | \(mm\) | - |
| \(S\) | - | strength | \(lbf\;/\;in^2\) | \(Pa\) | - |
| \(Sr\) | - | Strouhal number | dimensionless | dimensionless | - |
| \(N\) | - | Stuart number | dimensionless | dimensionless | - |
| \(SA\) | - | suction specific speed available | \(rpm\) | \(rpm\) | - |
| \(\Sigma\) | Sigma | summation | - | - | - |
| \(S\) | Summerfeld number | - | - | - | |
| sun age | constant | constant | \(1.4420\;x\;10^{17}\;s\) | ||
| sun escape velocity | constant | constant | \(6.176\;x\;10^2\;m\;s^{-1}\) | ||
| sun loss of mass due to elmag radiation | constant | constant | \(4.273\;x\;10^{9}\;kg\;s^{-1}\) | ||
| sun luminous effect | constant | constant | \(98\;lm\;kg^{-1}\;m^{-2}\;s^3\) | ||
| sun mass | constant | constant | \(1.989\;10\;x\;10^{30}\;kg\) | ||
| sun mean density | constant | constant | \(1.408\;x\;10^3\;kg\;m^3\) | ||
| sun mean radius | constant | constant | \(6.9550\;x\;10^8\;m\) | ||
| sun photosphere temperature | constant | constant | \(5778\;K\) | ||
| sun surface gravity on equator | constant | constant | \(2.74\;x\;10^2\;m\;s^{-2}\) | ||
| sun total neutrino emissions | constant | constant | \(1.830\;x\;10^{38}\;s^{-1}\) | ||
| sun volume | constant | constant | \(1.412\;26\;x\;10^{27}\;m^3\) | ||
| \(H_c\) | - | superconductor critical field strength | - | - | - |
| \(T_c\) | - | superconductor critical transition temperature | - | - | - |
| \(\Delta\) | Delta | superconductor energy gap | - | - | - |
| \(S\) | - | surface area | \(ft^2\) | \(m^2\) | - |
| \(\sigma\) | sigma | surface change density | - | - | - |
| \(h_{pd}\) | - | surface discharge pressure | \(ft\) | \(m\) | - |
| \(S\) | - | surface | - | - | - |
| \(S4S\) | - | surface 4 sided | - | - | - |
| \(h_{ps}\) | - | surface suction head | \(ft\) | \(m\) | - |
| \(\pi\) | pi | surface pressure | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(T_s\) | - | surface temperature | \(^\circ F\) | \(C\) | - |
| \(\gamma\), \(\;\sigma\) | gamma, sigma | surface tension | \(lbf\;/\;ft\) | \(N\;/\;m\) | - |
| \(B\) | - | susceptance | - | - | - |
| \(s\) | - | symmetry number | - | - | - |
| Symbol | Greek Symbol | Definition | US | Metric | Value |