# Formula Symbols - S

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

## Formula Symbols

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## S

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SymbolGreek SymbolDefinitionEnglishMetricSIValue
$$S_0/R$$ - Sackur-Tetrode constant dimensionless constant $$-1.164\;8708$$
$$SF$$ - safety factor dimensionless -
$$S$$ - sag $$in$$ $$mm$$ $$mm$$ -
$$Q_s$$ - sand quantity - - - -
$$r_s$$ - sand ratio dimensionless -
$$\rho_{sat}$$ rho saturated bulk density of soil $$\large{ \frac{lbm}{ft^3} }$$ $$\large{ \frac{kg}{m^3} }$$ $$kg - m^{-3}$$ -
$$\gamma_{sat}$$ gamma saturated unit weight $$\large{ \frac{lbf}{ft^3} }$$ $$\large{ \frac{N}{m^3} }$$ $$kg-m-s^{-2}$$ -
$$e_s$$ - saturated vapor pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$  -
$$Sc$$ - Schmidt number dimensionless  -
$$SEER$$ - seasonable energy efficiency ratio dimensionless  -
$$\Delta S$$ - second law of thermodynamics $$\large{\frac{Btu}{lbm-R}}$$ $$\large{\frac{kJ}{kg-K}}$$  $$kJ-kg^{-1}-K^{-1}$$ -
$$I$$ - second moment of area $$in^4$$ $$mm^4$$ $$mm^4$$  -
$$c_2$$ - second radiation constant - $$\frac{m}{K}$$  $$m-K^{-1}$$  $$1.438\;776\;877...\;x\;10^{-2}$$ $$\frac{m}{K}$$
$$S$$ - section modulus

$$in^3$$

$$mm^3$$ $$mm^3$$  -
$$S_{required}$$  - section modulus required not to exceed allowable bending stress $$in^3$$  $$mm^3$$  $$mm^3$$  -
$$S_x$$  - section modulus with the respect to the x-centroidal axis $$in^3$$  $$mm^3$$  $$mm^3$$  -
$$S_y$$  - section modulus with the respect to the y-centroidal axis $$in^3$$  $$mm^3$$  $$mm^3$$  -
$$w_s$$ - sediment fall velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m-s^{-1}$$ -
$$S$$ - Seebeck coefficient - $$\large{\frac{V}{K}}$$ $$V-K^{-1}$$ -
$$v_s$$ - seepage velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m-s^{-1}$$  -
$$L$$ - self-inductance - - -  -
$$\delta$$ delta semivertex angle $$deg$$ $$rad$$ $$rad$$  -
$$Q_s$$ - sensible heat $$\large{\frac{Btu}{lbm}}$$ $$\large{\frac{kJ}{kg}}$$ $$kJ-kg^{-1}$$ -
$$B$$ - separation distance $$ft$$ $$m$$ $$m$$  -
$$SC$$ - shading coefficient dimensionless  -
$$F_s$$ - shading factor dimensionless  -
$$d$$ - shaft deflection $$in$$ $$mm$$ $$mm$$  -
$$k$$ - shape factor $$dimensionless$$  -
$$\phi$$ phi shear angle $$deg$$ $$rad$$ $$rad$$ -
$$J$$ - shear compliance - - -  -
$$q$$ - shear flow $$\large{\frac{lbf}{ft}}$$ $$\large{\frac{kg}{m}}$$  $$kg-m^{-1}$$     -
$$J"$$ - shear loss compliance - - -  -
$$G"$$ - shear loss modulus - - -  -
$$G$$, $$\;\mu$$ mu shear modulus $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$  -
$$\dot {\gamma}$$ gamma shear rate $$\large{\frac{1}{sec}}$$ $$\large{\frac{1}{s}}$$ $$1-s^{-1}$$  -
$$\delta_s$$ delta shear deformation $$in$$ $$mm$$ $$mm$$  -
$$V$$ - shear force $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$  -
$$G$$ - shear modulus $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$  -
$$\dot {\gamma}$$ gamma shear rate $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$  -
$$\gamma$$ gamma shear strain $$deg$$ $$rad$$ $$rad$$  -
$$\tau$$ tau shear stress $$\large{\frac{lbf}{in^2}}$$  $$MPa$$  $$N-mm^{-2}$$  -
$$\tau_{butt}$$ tau sheat stress of weld $$\large{\frac{lbf}{in^2}}$$  $$MPa$$  $$N-mm^{-2}$$ -
$$\tau_{\theta}$$ tau shear stress in any oblique plane $$\large{\frac{lbf}{in^2}}$$  $$MPa$$  $$N-mm^{-2}$$  -
$$u*$$ - shear velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m-s^{-1}$$ -
$$\sigma$$ sigma sheat tension $$lbf$$ $$N$$ $$kg - m - s^{-2}$$  -
$$Sh$$ - Sherwood number dimensionless  -
$$\theta$$, $$\;\tau_*$$ - Shields parameter dimensionless  -
$$\theta$$ theta shock semivertex angle $$deg$$ $$rad$$ $$rad$$  -
$$\sigma$$ sigma short range order parameter - - -  -
$$SL$$ - shrinkage limit $$ft$$ $$m$$ $$m$$ -
$$s$$ - side length $$ft$$ $$m$$ $$m$$  -
$$S$$ - sight distance for stopping or passing $$ft$$ $$m$$ $$m$$ -
$$\mu$$ mu simple viscosity $$\large{\frac{lbf - sec}{ft^2}}$$ $$Pa - s$$ $$kg-m^{-1}-s^{-1}$$  -
$$C_f$$ - skin friction coefficient dimensionless  -
$$G$$ - slipping - -    -
$$m$$ - slope $$ft$$ $$m$$ $$m$$  -
$$l$$ - slope length $$ft$$ $$m$$ $$m$$ -
$$S$$ - slope steepness $$ft$$ $$m$$ $$m$$ -
$$\phi$$ phi slope of the deflection of a beam at a point $$deg$$ $$rad$$ $$rad$$  -
$$Q_s$$ - slug flow $$\large{\frac{ft^3}{sec}}$$ $$\large{\frac{m^3}{s}}$$  $$m^3-s^{-1}$$ -
$$F_s$$ - slug force $$lbf$$ $$N$$ $$kg-m-s^{-2}$$ -
$$\rho_s$$ rho slug liquid density $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$  $$kg-m^{-3}$$    -
$$\eta_s$$ eta slurry viscosity $$\large{\frac{lbf - sec}{ft^2}}$$ $$Pa-s$$ $$kg - m^{-1} - s^{-1}$$  -
$$K$$ - soil erodibility factor dimensionless -
$$SCL$$ - solar cooling load factor dimensionless  -
$$\Omega$$, $$\;\omega$$ Omega, omega solid angle $$deg$$ $$rad$$ $$rad$$  -
$$\gamma_s$$ gamma solid unit weight $$lbf$$ $$N$$ $$kg-m-s^{-2}$$ -
$$S$$ - Sommerfield number dimensionless  -
$$SB$$ - Souders-Brown equation $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$ -
$$a$$ - sound $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$  -
$$W$$ - sound energy flux - - -  -
$$L_w$$ - sound power level - - -  -
$$u$$ - sound particle velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m - s^{-1}$$  -
$$L_p$$ - sound pressure level - - -  -
$$L$$ - span length under consideration $$ft$$ or $$in$$ $$m$$ or $$mm$$ $$m$$ or $$mm$$  -
$$U$$ - specific cutting energy - - -  -
$$h$$ - specific enthalpy $$\large{\frac{Btu}{lbm}}$$ $$\large{\frac{kJ}{kg}}$$  $$kJ-kg^{-1}$$  -
$$C_d$$ - specific flow coefficient - - -  -
$$R$$ - specific gas constant $$\large{\frac{lbf-ft}{lbm-R}}$$ $$\large{\frac{J}{kg-K}}$$  $$J-kg^{-1}-K^{-1}$$  $$287$$ $$\large{\frac{J}{kg-K}}$$
$$SG$$ - specific gravity dimensionless  -
$$SG$$, $$\;SG_g$$ - specific gravity of gas dimensionless  -
$$SG$$, $$\;SG_l$$ - specific gravity of liquid dimensionless  -
$$SG_s$$ - specific gravity of soil dimensionless -
$$c$$ - specific heat $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{kJ}{kg-K}}$$  $$kJ-kg^{-1}-K^{-1}$$  -
$$Q$$, $$\;c_p$$ - specific heat capacity $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{kJ}{kg-K}}$$  $$kJ-kg^{-1}-K^{-1}$$  -
$$C_p$$ - specific heat constant pressure $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{kJ}{kg-K}}$$   $$kJ-kg^{-1}-K^{-1}$$  -
$$C_v$$ - specific heat constant volume $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{kJ}{kg-K}}$$  $$kJ-kg^{-1}-K^{-1}$$  -
$$c_a$$ - specific heat of air $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{kJ}{kg-K}}$$  $$kJ-kg^{-1}-K^{-1}$$  -
$$c_l$$ - specific heat of liquid $$\large{\frac{Btu}{lbm-F}}$$ $$\large{\frac{kJ}{kg-K}}$$  $$kJ-kg^{-1}-K^{-1}$$  -
$$\gamma$$, $$\;\kappa$$, $$\;k$$ gamma, kappa specific heat ratio dimensionless  -
$$F_k$$ - specific heat ratio factor dimensionless  -
$$I_{sp}$$ - specific impulse $$sec$$ $$s$$ $$s$$   -
$$u$$ - specific internal energy $$\large{\frac{Btu}{lbm}}$$  $$\large{\frac{kJ}{kg}}$$   $$kJ-kg^{-1}$$  -
$$R_{\lambda}$$ lambda specific thermal resistance $$\large{\frac{ft^2-hr-F}{Btu}}$$ $$\large{\frac{K-m}{W}}$$  $$K-m-W^{-1}$$  -
$$\eta_{sp}$$ eta specific viscosity $$\large{\frac{lbf - sec}{ft^2}}$$ $$Pa-s$$  $$kg - m^{-1} - s^{-1}$$  -
$$v$$, $$\;\upsilon$$ upsilon specific volume $$\large{\frac{ft^3}{lbm}}$$ $$\large{\frac{m^3}{kg}}$$  $$m^3-kg^{-1}$$  -
$$\gamma$$ gamma specific weight $$\large{\frac{lbf}{ft^3}}$$ $$\large{\frac{N}{m^3}}$$  $$N-m^{-3}$$  -
$$\gamma_a$$ gamma specific weight of air $$\large{\frac{lbf}{ft^3}}$$ $$\large{\frac{N}{m^3}}$$  $$N-m^{-3}$$  -
$$w$$ - specific work $$\large{\frac{lbf-ft}{lbm}}$$ $$\large{\frac{kJ}{kg}}$$   $$kg-kg^{-1}$$ -
$$f_{c}{'}$$ - specified 28 day compressive strength of concrete $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$ -
$$u$$, $$\;v$$ - speed $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$  -
$$s$$ - speed (rpm) $$\large{\frac{rev}{sec}}$$ $$\large{\frac{rev}{s}}$$  $$rev-s^{-1}$$    -
$$c$$   speed of light $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$ $$299\;792\;458$$ $$\large{\frac{m}{s}}$$
$$c$$ - speed of light in vacuum $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$ $$299\;792\;458$$ $$\large{\frac{m}{s}}$$
$$c$$ - speed of light wave velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$ $$299\;792\;458$$ $$\large{\frac{m}{s}}$$
$$v$$ - speed of moving charge $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$
$$a$$ - speed of sound $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$  -
$$S$$, $$\;s_i$$ - spin - - -  -
$$L_c$$ - spring coil wire length $$in$$ $$mm$$ $$mm$$ -
$$k$$, $$\;k_s$$ - spring constant $$\large{\frac{lbf}{ft}}$$ $$\large{\frac{N}{m}}$$  $$N-m^{-1}$$    -
$$d_s$$ - spring displacement $$in$$ $$mm$$ $$mm$$  -
$$d_s$$   spring deflection $$in$$ $$mm$$ $$mm$$ -
$$E$$, $$\;E_s$$ - spring energy $$lbf-ft$$ $$J$$ $$kg-m^2-s^{-2}$$  -
$$x_0$$ - spring equilibrium position $$in$$ $$mm$$ $$mm$$ -
$$F_s$$ - spring force $$lbf$$ $$N$$ $$kg-m-s^{-2}$$  -
$$k_s$$ - spring force constant $$\large{lbf-ft}$$ $$\large{\frac{N}{m}}$$  $$N-m^{-1}$$    -
$$l_f$$ - spring free length $$in$$ $$mm$$ $$mm$$ -
$$C$$ - spring index dimensionless  -
$$D_i$$ - spring inside diameter $$in$$ $$mm$$ $$mm$$ -
$$l_i$$ - spring installed length $$in$$ $$mm$$ $$mm$$ -
$$P$$ - spring load $$lbf$$ $$kg$$ $$kg$$  -
$$n$$, $$\; n_a$$  - spring number of active coils dimensionless -
$$l_o$$ - spring operating length $$in$$ $$mm$$ $$mm$$  -
$$D_o$$ - spring outside diameter $$in$$ $$mm$$ $$mm$$ -
$$p$$ - spring pitch $$in$$ $$mm$$ $$mm$$ -
$$PE_s$$ - spring potential energy $$lbf-ft$$ $$J$$ $$kg-m^2-s^{-2}$$  -
$$n_s$$ - spring rate $$in$$ $$mm$$ $$mm$$ -
$$n_t$$ - spring total number of coils dimensionless -
$$L_t$$ - spring total wire length $$in$$ $$mm$$ $$mm$$ -
$$G$$ - spring shear modulus of material $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$ -
$$\tau$$ tau spring shear stress $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$ -
$$l_s$$ - spring solid length or shut length $$in$$ $$mm$$ $$mm$$  -
$$C_s$$ - spring space between coils $$in$$ $$mm$$ $$mm$$  -
$$d$$ - spring wire diameter $$in$$ $$mm$$ $$mm$$ -
$$S$$, $$\;\sigma$$ - spring wire stress $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$ -
$$p_s$$ - stagnation pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$  -
$$R*$$ - standard atmosphere at sea level $$millibars$$ $$millibars$$ $$millibars$$   $$1013.25$$ $$millibars$$
$$\sigma$$, $$\;SD$$ sigma standard deviation - - - -
$$g$$ - standard gravity $$\large{\frac{ft}{sec^2}}$$ $$\large{\frac{m}{s^2}}$$  $$m-s^{-2}$$   $$9.806\;65$$ $$\large{\frac{m}{s^2}}$$
$$g$$ - standard gravity acceleration $$\large{\frac{ft}{sec^2}}$$ $$\large{\frac{m}{s^2}}$$  $$m-s^{-2}$$   $$9.806\;65$$ $$\large{\frac{m}{s^2}}$$
$$St$$ - Stanton number dimensionless  -
$$h_{sd}$$ - static discharge head $$ft$$ $$m$$ $$m$$   -
$$SE$$ - static efficiency dimensionless  -
$$f_s$$ - static friction $$lbf$$ $$N$$ $$kg-m-s^{-2}$$  -
$$\mu_s$$ mu static friction coefficient dimensionless  -
$$h_s$$ - static head $$ft$$ $$m$$ $$m$$  -
$$HP_o$$ - static horsepower output $$\large{\frac{ft-lbf}{sec}}$$ $$\large{\frac{J}{s}}$$  $$J-s^{-1}$$ -
$$SP$$ - static pressure $$\large{\frac{ft^3}{min}}$$ $$\large{\frac{m^3}{min}}$$  $$m^3-min^{-1}$$  -
$$h_{ss}$$ - static suction head $$ft$$ $$m$$ $$m$$  -
$$\rho_s$$ rho steam density $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$  $$kg-m^{-3}$$  -
$$Q_s$$ - steam flow rate $$\large{\frac{ft^3}{sec}}$$ $$\large{\frac{m^3}{s}}$$  $$m^3-s^{-1}$$  -
$$Q_s$$ - steam flow rate through piping $$\large{\frac{ft^3}{sec}}$$ $$\large{\frac{m^3}{s}}$$  $$m^3-s^{-1}$$ -
$$\Psi$$ Psi steam function - - -  -
$$L$$, $$\;L_s$$ - steam latent heat $$lbf-ft$$ $$J$$ $$kg-m^2-s^{-2}$$  -
$$d$$ - steam pipe sizing $$in$$ $$mm$$ $$mm$$ -
$$\Phi$$ Phi steam potential - - -  -
$$p_l$$ - steam pressure loss through piping $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$ -
$$v_s$$ - steam velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$  -
$$v_s$$ - steam velocity through piping $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$ -
$$Ste$$ - Stefan number dimensionless  -
$$\sigma$$ sigma Stefan-Boltzmann constant $$\large{\frac{Btu}{hr-ft^2-R^4}}$$ $$\large{\frac{W}{m^2-K^4}}$$  $$W-m^{-2}-K^{-4}$$  $$5.670\;374\;419...\;x\;10^{-8}$$ $$\large{\frac{W}{m^2-K^4}}$$
$$P$$ - Stefan-Boltzmann law $$lbf-ft$$ $$J$$ $$kg-m^2-s^{-2}$$ -
$$k$$ - stiffness $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$  -
$$St$$ - Stokes' law $$lbf$$ $$N$$ $$kg-m-s^{-2}$$  -
$$Stk$$, $$\;S_k$$ - Stokes number dimensionless  -
$$SE$$ - Stokes-Einstein equation $$lbf$$ $$N$$ $$kg-m-s^{-2}$$ -
$$d$$ - stopping distance $$ft$$ $$m$$ $$m$$ -
$$SSD$$, $$\;S$$ - stopping sight distance $$ft$$ $$m$$ $$m$$ -
$$\epsilon$$ epsilon strain $$\large{\frac{in}{in}}$$ $$\large{\frac{mm}{mm}}$$   $$mm-mm^{-1}$$  -
$$\epsilon_o$$ epsilon strain amplitude - - -  -
$$U$$ - strain energy $$lbf-ft$$ $$J$$ $$kg-m^2-s^{-2}$$  -
$$S$$ - strength $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$  -
$$K$$ - strength coefficient - - -  -
$$S$$, $$\;\sigma$$ sigma stress $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N-mm^{-2}$$  -
$$L$$ - stroke $$in$$ $$mm$$ $$mm$$  -
$$L$$ - stroke length $$in$$ $$mm$$ $$mm$$  -
$$S$$ - strength - - -  -
$$Sr$$ - Strouhal number dimensionless  -
$$N$$ - Stuart number dimensionless  -
$$C_{NPSH}$$ - suction head coefficient dimensionless -
$$SA$$ - suction specific speed available $$\large{\frac{rev}{min}}$$ $$\large{\frac{rev}{min}}$$  $$rev-min^{-1}$$  -
$$\Sigma$$ Sigma summation - - -  -
- - sun age $$b-yr$$ $$b-yr$$ $$b-yr$$ $$4.603$$ $$b-yr$$
-  - sun escape velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$  $$m-s^{-1}$$ $$6.15$$ $$\large{\frac{m}{sec}}$$
-  - sun mass $$lbm$$ $$kg$$ $$km$$ $$1.98892\;x\;10^{30}$$ $$kg$$
-  - sun mean density $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$   $$kg-m^{-3}$$ $$1.622\;x\;10^5$$ $$\large{\frac{kg}{m^3}}$$
-  - sun mean radius $$mi$$ $$km$$ $$km$$ $$695,500$$ $$km$$
-  - sun photosphere temperature $$F$$ $$K$$ $$x-273.15\;C$$  about $$10,000$$ $$F$$
- - sun surface gravity on equator $$\large{\frac{ft}{sec^2}}$$  $$\large{\frac{m}{s^2}}$$  $$m-s^{-2}$$  $$27.94$$ $$\large{\frac{m}{s^2}}$$
-  - sun volume $$ft^3$$ $$m^3$$ $$m^3$$ $$1.412\;x\;10^{18}$$ $$m^3$$
$$S$$ - surface area $$ft^2$$ $$m^2$$ $$m^2$$  -
$$\sigma$$ sigma surface change density $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$ $$kg-m^{-3}$$  -
$$h_{pd}$$ - surface discharge pressure $$ft$$ $$m$$ $$m$$  -
$$S$$ - surface - - -  -
$$S4S$$ - surface 4 sided - - -  -
$$h_{pd}$$ - surface discharge pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$ -
$$h_{ps}$$ - surface suction head $$ft$$ $$m$$ $$m$$  -
$$h_{ps}$$ - surface suction pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$ -
$$\pi$$ pi surface pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg-m^{-1}-s^{-2}$$  -
$$T_s$$ - surface temperature $$F$$ $$C$$ $$x+273.15\;K$$  -
$$\gamma$$, $$\;\sigma$$ gamma, sigma surface tension $$\large{\frac{lbf}{ft}}$$ $$\large{\frac{N}{m}}$$  $$N-m^{-1}$$   -
$$s$$ - symmetry number dimensionless  -
$$H$$ - system head $$ft$$ $$m$$ $$m$$ -
Symbol Greek Symbol Definition English Metric   Value

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