# Formula Symbols - H

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

## Formula Symbols

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

## H

SymbolGreek SymbolDefinitionUSMetricValue
$$Hg$$ - Hagen number dimensionless dimensionless -
$$T_{\frac{1}{2}}$$, $$\;\tau_{\frac{1}{2}}$$ tau half life - -  -
$$A_h$$, $$\;R_h$$ - Hall coefficient - -  -
$$H$$ - Hamiltonian function - -  -
$$Ha$$ - Hartmann number dimensionless dimensionless  -
$$E_h$$ - Hartree energy constant constant $$4.359\;744\;722\;2071\;x\;10^{-18}\;J$$
$$Ha$$ - Hatta number dimensionless dimensionless  -
$$P_h$$ - Havnes number dimensionless dimensionless  -
$$C$$ - Hazen-Williams coefficient - -  -
$$C$$ - Hazen-Williams friction coefficient - -  -
$$hc$$ - hc constant constant  -
$$h$$ - head $$ft$$ $$m$$  -
$$h_f$$ - head fractional resistance - -  -
$$HGV$$ - head gasket volume $$in^3$$ $$cc^3$$  -
$$h_l$$ - head loss $$ft$$ $$m$$  -
$$h_f$$ - head loss due to ftiction $$ft$$ $$m$$  -
$$q$$ - heat $$ft-lbf$$ $$J$$  -
$$q$$ - heat $$Btu$$ $$kJ$$  -
$$q$$ - heat $$HP-hr$$ $$MJ$$  -
$$\partial$$  partial heat as a path function - -  -
$$C$$, $$\;c_p$$ - heat capacity $$Btu\;/\; ^\circ F$$ $$kJ\;/\;K$$  -
$$C_p$$ - heat capacity at constant pressure $$Btu\;/\; ^\circ F$$ $$kJ\;/\;K$$ -
$$\gamma$$, $$\;\kappa$$, $$\;k$$ gamma, kappa heat capacity ratio dimensionless dimensionless  -
$$Q_c$$ - heat conduction $$Btu\;/\; hr-ft^2- ^\circ F$$ $$W\;/\;m^2-K$$  -
$$\lambda$$ lambda heat conductivity - - -
$$C_p$$ - heat constant pressure - -  -
$$C_v$$ - heat constant volume - -  -
$$q$$ - heat content - -  -
$$Q$$ - heat convection - -  -
$$\Delta Q$$ - heat differential $$^\circ F$$ $$^\circ C$$  -
$$\kappa$$ kappa heat diffusivity - - -
$$Q$$, $$\;q$$ - heat enargy $$ft-lbf$$ $$J$$  -
$$Q$$, $$\;Q_f$$, $$\;\Phi$$ Phi heat flow rate $$Btu\;/\; hr-ft^2- ^\circ F$$ $$W\;/\;m^2-K$$  -
$$Q"$$ - heat flux - -  -
$$HGV$$ - heat gasket volume $$in^3$$ $$cc^3$$  -
$$G$$ - heat generation rate $$Btu\;/\;hr-ft^3$$ $$W\;/\;m^3$$  -
$$H_i$$   heat input required $$Btu$$ $$kg$$  -
$$q$$ - heat loss $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$  -
$$K$$ - heat loss coefficient of a device dimensionless dimensionless  -
$$q$$ - heat per unit mass $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$  -
$$Q$$, $$\;\phi$$ phi heat radiation - -  -
$$Q$$ - heat transfer $$Btu\;/\;hr$$ $$W$$  -
$$Q_c$$ - heat transfer by conduction - -  -
$$Q_c$$ - heat transfer by convection - -  -
$$Q_r$$ - heat transfer by radiation - -  -
$$h$$, $$\;h_c$$ - heat transfer coefficient $$Btu\;/\;hr-ft^2-^\circ F$$ $$W\;/\;m^2 - K$$  -
$$Q_t$$ - heat transfer rate $$Btu\;/\;hr-ft^2-^\circ F$$ $$W\;/\;m^2 - K$$  -
$$Q$$ - heat transfer to a system - -  -
$$H_v$$ - heat of vaporization $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$ -
$$HV$$ - heating value $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$  -
$$h$$ - height $$in \;or\; ft$$ $$mm \;or\; m$$  -
$$h_1$$ - height of drivers' eyes above the roadway surface $$ft$$ $$m$$ -
$$h_2$$ - height of object above the roadway surface $$ft$$ $$m$$ -
$$He$$ - Hedstrom number dimensionless dimensionless -
$$h$$ - height of fluid column $$in \;or\; ft$$ $$mm \;or\; m$$  -
$$A$$ - Helmholtz function - -  -
$$He$$ - Helmholtz number dimensionless dimensionless  -
$$k_H$$ - Henry's law constant - -  -
$$HHV$$ - higher heating value $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$  -
$$T_h$$   higher temperature $$Btu\;/\;lbm$$ $$kJ\;/\;kg$$  -
$$n$$, $$\;n_n$$ - hole number density - -  -
$$H$$ - horizontal cable force $$lbf$$ $$N$$  -
$$x$$ - horizontal distance $$ft$$ $$m$$  -
$$x$$ - horizontal position $$ft$$ $$m$$  -
$$H$$ - horizontal reaction load at bearing load $$lbf$$ $$N$$  -
$$HP$$, $$\;hp$$ - horsepower - -  -
$$HP$$, $$\;hp$$ - horsepower (air) $$ft-lbf\;/\;s$$ -  -
$$HP$$, $$\;hp(S)$$ - horsepower (boiler) $$Btu\;/\;h$$ -  -
$$HP$$, $$\;hp(E)$$ - horsepower (electric) $$W$$ -  -
$$HP$$, $$\;hp(I)$$ - horsepower (mechanical) $$ft-lbf\;/\;min$$ $$kgf-m\;/\;s$$  -
$$HP$$, $$\;hp(M)$$ - horsepower (metric) - $$kgf-m\;/\;s$$  -
$$He$$ - Henry's law constant $$l\;/\;atm$$ $$l\;/\;atm$$  -
$$HWD$$ - hot well depression $$^\circ F$$ $$^\circ C$$  -
$$H_0$$ - Hubble constant constant constant  $$2.27\;Es^{-1}$$
$$\omega$$ omega humidity ratio $$lbm\;/\;lbm$$ $$kg\;/\;kg$$  -
$$k$$ - hydraulic conductivity $$ft\;/\;sec$$ $$m\;/\;sec$$  -
$$d_h$$ - hydraulic diameter $$ft$$ $$m$$  -
$$i$$ - hydraulic gradient dimensionless dimensionless  -
$$HHP$$, $$\;HP_h$$ - hydraulic horsepower $$hp$$ - -
$$r_h$$ - hydraulic radius $$ft$$ $$m$$  -
$$S$$   hydraulic slope $$ft$$ $$m$$  -
$$H$$ - hydrogen density $$lb\;/\;ft^3$$ $$kg\;/\;m^3$$  -
$$H$$ - hydrogen gas - -  -
$$HP$$ - hydrostatic pressure $$lb\;/\;in^2 \;or\; psi$$ $$Pa$$  -
$$HDS$$ - hydrostatic stress $$lb\;/\;in^2 \;or\; psi$$ $$Pa$$  -
$$F$$ - hyperfine - -  -
$$\Delta \nu_cs$$  \nu hyperfine transition frequency of 133Cs constant constant $$9\;192\;631\;770\;Hz$$
Symbol Greek Symbol Drfinition US Metric Value

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