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"H" Formula SymbolsA - 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 | ||||||
|---|---|---|---|---|---|---|
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
| \(Hg\) | - | Hagen number | dimensionless | dimensionless | dimensionless | - |
| \(\Delta p\) | - | Hagen–Poiseuille | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| \(T_{\frac{1}{2}}\), \(\;\tau_{\frac{1}{2}}\) | tau | half life | - | - | - | - |
| \(A_h\), \(\;R_h\) | - | Hall coefficient | - | - | - | - |
| \(H\) | - | Hamiltonian function | - | - | - | - |
| \(Ha\) | - | Hartmann number | dimensionless | dimensionless | dimensionless | - |
| \(E_h\) | - | Hartree energy | \(lbf-ft\) | \(J\) | \(kg - m^2 - s^{-2}\) | \(4.359\;744\;722\;2071\;(85)\;x\;10^{-18}\) \(J\) |
| \(Ha\) | - | Hatta number | dimensionless | dimensionless | dimensionless | - |
| \(P_h\) | - | Havnes number | dimensionless | dimensionless | dimensionless | - |
| \(C\) | - | Hazen-Williams coefficient | dimensionless | dimensionless | dimensionless | - |
| \(Q\) | - | Hazen-Williams flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(p_d\) | - | Hazen-Williams flow through a pressurized pipe | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| \(v\) | - | Hazen-Williams flow through a open channel | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(h_f\) | - | Hazen-Williams head loss due to friction | \(ft\) | \(m\) | \(m\) | - |
| \(m\) | - | Hazen-Williams hydraulic grade | \(ft\) | \(m\) | \(m\) | - |
| \(r_h\) | - | Hazen-Williams hydraulic radius | \(in\) | \(mm\) | \(mm\) | - |
| \(v\) | - | Hazen-Williams mean flow velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m - s^{-1}\) | - |
| \(d\) | - | Hazen-Williams pipe inside diameter | \(in\) | \(mm\) | \(mm\) | - |
| \(hc\) | - | hc | constant | - | ||
| \(h\) | - | head | \(ft\) | \(m\) | \(m\) | - |
| \(h_f\) | - | head friction loss in fittings and valves | dimensionless | dimensionless | dimensionless | - |
| \(h_f\) | - | head fractional resistance | - | - | - | - |
| \(HGV\) | - | head gasket volume | \(in^3\) | \(mm^3\) | \(mm^3\) | \(HGV\)- |
| \(h_l\) | - | head loss | \(ft\) | \(m\) | \(m\) | - |
| \(h_f\) | - | head loss due to ftiction | \(ft\) | \(m\) | \(m\) | - |
| \(p\) | - | head pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(v\) | - | head velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(h_{dv}\) | - | head velocity discharge | \(ft\) | \(m\) | \(m\) | - |
| \(h_{sv}\) | - | head velocity suction | \(ft\) | \(m\) | \(m\) | - |
| \(Q\) | - | heat | \(\large{\frac{Btu}{lbm}}\) | \(\large{\frac{kJ}{kg}}\) | \(kJ-kg^{-1}\) | - |
| \(\partial\) | partial | heat as a path function | - | - | - | - |
| \(C\), \(\;c_p\) | - | heat capacity | \(\large{\frac{Btu}{F}}\) | \(\large{\frac{kJ}{K}}\) | \(kJ-K^{-1}\) | - |
| \(C_p\) | - | heat capacity at constant pressure | \(\large{\frac{Btu}{F}}\) | \(\large{\frac{kJ}{K}}\) | \(kJ-K^{-1}\) | - |
| \(C_v\) | - | heat capacity at constant volume | \(\large{\frac{Btu}{F}}\) | \(\large{\frac{kJ}{K}}\) | \(kJ-K^{-1}\) | - |
| \(\gamma\), \(\;\kappa\), \(\;k\) | gamma, kappa | heat capacity ratio | dimensionless | dimensionless | dimensionless | - |
| \(Q_c\) | - | heat conduction | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(\lambda\) | lambda | heat conductivity | - | - | - | - |
| \(C_p\) | - | heat constant pressure | - | - | - | - |
| \(C_v\) | - | heat constant volume | - | - | - | - |
| \(q\) | - | heat content | \(\large{\frac{Btu}{lbm}}\) | \(\large{\frac{J}{kg}}\) | \(J-kg^{-1}\) | - |
| \(Q\) | - | heat convection | - | - | - | - |
| \(\Delta Q\) | - | heat differential | \(\large{\frac{Btu}{lbm}}\) | \(\large{\frac{J}{kg}}\) | \(J-kg^{-1}\) | - |
| \(\kappa\) | kappa | heat diffusivity | \(\large{\frac{ft^2}{sec}}\) | \(\large{\frac{m^2}{s}}\) | \(m^2-s^{-1}\) | - |
| \(Q\), \(\;q\) | - | heat energy | - | - | - | - |
| \(Q\), \(\;Q_f\), \(\;\Phi\) | Phi | heat flow rate | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(Q"\) | - | heat flux | \(\large{\frac{Btu}{hr-ft^2}}\) | \(\large{\frac{W}{m^2}}\) | \(W-m^{-2}\) | - |
| \(q\) | - | heat loss | \(F\) | \(C\) | \(x+273.15\;K\) | - |
| \(K\) | - | heat loss coefficient of a device | dimensionless | dimensionless | dimensionless | - |
| \(d\) | - | heat penetration | \(in\) | \(mm\) | \(mm\) | - |
| \(Q\), \(\;\phi\) | phi | heat radiation | - | - | - | - |
| \(HRR\) | - | heat release rate | \(\large{\frac{Btu}{ft^2-hr}}\) | \(\large{\frac{W}{m^2}}\) | \(W-m^{-2}\) | - |
| \(Q\) | - | heat transfer | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(Q_c\) | - | heat transfer by conduction | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(R_t\) | - | heat transfer by conduction resistance through a cylindrical wall | \(\large{\frac{hr-F}{Btu}}\) | \(\large{\frac{K}{W}}\) | \(K-W^{-1}\) | - |
| \(Q_c\) | - | heat transfer by conduction through a cylindrical wall | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(Q_c\) | - | heat transfer by conduction through a plane wall | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(Q_c\) | - | heat transfer by convection | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(Q_r\) | - | heat transfer by radiation | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(h\), \(\;h_c\) | - | heat transfer coefficient | \(\large{\frac{Btu}{hr-ft^2-F}}\) | \(\large{\frac{W}{m^2-K}}\) | \(W-m^{-2} -K^{-1}\) | - |
| \(h_{wall}\) | - | heat transfer coefficient of a pipe wall | \(\large{\frac{Btu}{hr-ft^2-F}}\) | \(\large{\frac{W}{m^2-K}}\) | \(W-m^{-2} -K^{-1}\) | - |
| \(Q_t\) | - | heat transfer rate | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(Q\) | - | heat transfer to a system | \(\large{\frac{Btu}{hr}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(H_v\) | - | heat of vaporization | \(\large{\frac{Btu}{lbm}}\) | \(\large{\frac{J}{kg}}\) | \(J-kg^{-1}\) | - |
| \(HV\) | - | heating value | \(\large{\frac{Btu}{lbm}}\) | \(\large{\frac{kJ}{kg}}\) | \(J-kg^{-1}\) | - |
| \(h\) | - | height | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(h_1\) | - | height of drivers' eyes above the roadway surface | \(ft\) | \(m\) | \(m\) | - |
| \(h_2\) | - | height of object above the roadway surface | \(ft\) | \(m\) | \(m\) | - |
| \(He\) | - | Hedstrom number | dimensionless | dimensionless | dimensionless | - |
| \(h\) | - | height of fluid column | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(A\) | - | Helmholtz function | - | - | - | - |
| \(He\) | - | Helmholtz number | dimensionless | dimensionless | dimensionless | - |
| \(C\) | - | Henry's law | \(\large{\frac{mol}{gal}}\) | \(\large{\frac{mol}{L}}\) | \(mol-L^{-1}\) | - |
| \(H_s\) | - | Henry's law constant (solubility) | - | \(\large{\frac{mol}{m^3-Pa}}\) | \(mol-m^{-3}-Pa^{-1}\) | - |
| \(H_v\) | - | Henry's law constant (volatility) | - | \(\large{\frac{m^3-Pa}{mol}}\) | \(m^3-Pa-mol^{-1}\) | - |
| \(HHV\) | - | higher heating value | \(\large{\frac{MMBtu}{lbm}}\) | \(\large{\frac{W}{m^2}}\) | \(W-m^{-2}\) | - |
| \(\sigma_h\) | sigma | hoop stress | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(H\) | - | horizontal cable force | \(lbf\) | \(N\) | \(kg - m - s^{-2}\) | - |
| \(x\) | - | horizontal distance | \(ft\) | \(m\) | \(m\) | - |
| \(x\) | - | horizontal distance from reaction to point on beam | \(in\) | \(mm\) | \(mm\) | - |
| \(x\) | - | horizontal position | \(ft\) | \(m\) | \(m\) | - |
| \(R\) | - | horizontal range of a projectile | \(ft\) | \(m\) | \(m\) | - |
| \(H\) | - | horizontal reaction load at bearing load | \(lbf\) | \(N\) | \(kg - m - s^{-2}\) | - |
| \(HP\), \(\;hp\) | - | horsepower | \(\large{\frac{lbf-ft}{sec}}\) | \(\large{\frac{J}{s}}\) | \(J-s^{-1}\) | - |
| \(HWD\) | - | hot well depression | - | - | - | - |
| \(H_0\) | - | Hubble constant | - | \(\large{\frac{1}{s}}\) | \(1-s^{-1}\) | \(2.25\;x\;10^{-18}\) \(\large{\frac{1}{s}}\) |
| \(\omega\) | omega | humidity ratio | \(\large{\frac{lbm}{lbm}}\) | \(\large{\frac{kg}{kg}}\) | \(kg-kg^{-1}\) | - |
| \(k\) | - | hydraulic conductivity | \(\large{\frac{ft}{day}}\) | \(\large{\frac{m}{day}}\) | \(m-day^{-1}\) | - |
| \(h_d\) | - | hydraulic depth | \(ft\) | \(m\) | \(m\) | - |
| \(d_h\) | - | hydraulic diameter | \(ft\) | \(m\) | \(m\) | - |
| \(d_h\) | - | hydraulic diameter of a duct, pipe or tube | \(in\) | \(mm\) | \(mm\) | - |
| \(d_h\) | - | hydraulic diameter of a rectangular tube | \(ft\) | \(m\) | \(m\) | - |
| \(d_h\) | - | hydraulic diameter of a right triangle | \(ft\) | \(m\) | \(m\) | - |
| \(d_h\) | - | hydraulic diameter of a square tube | \(in\) | \(mm\) | \(mm\) | - |
| \(d_h\) | - | hydraulic diameter of a tube within a tube | \(in\) | \(mm\) | \(mm\) | - |
| \(d_h\) | - | hydraulic diameter of an ellipse | \(in\) | \(mm\) | \(mm\) | - |
| \(d_h\) | - | hydraulic diameter of an isosceles triangle | \(ft\) | \(m\) | \(m\) | - |
|
\(n_h\) |
hydraulic efficiency | dimensionless | dimensionless | dimensionless | - | |
| \(E_h\) | - | hydraulic energy | \(lbf-ft\) | \(J\) | \(kg - m^2 - s^{-2}\) | - |
| \(i\) | - | hydraulic gradient | dimensionless | dimensionless | dimensionless | - |
| \(Q\) | - | hydraulic gradient flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(h\) | - | hydraulic head | \(ft\) | \(m\) | \(m\) | |
| \(HHP\), \(\;HP_h\) | - | hydraulic horsepower | \(\large{\frac{lbf-ft}{sec}}\) | \(\large{\frac{J}{s}}\) | \(J-s^{-1}\) | - |
| \(P_h\) | - | hydraulic power | \(\large{\frac{lbm-ft^2}{sec}}\) | \(\large{\frac{kg-m^2}{s}}\) | \(kg-m^2-s^{-1}\) | - |
| \(n_h\) | - | hydraulic pump efficiency | dimensionless | dimensionless | dimensionless | - |
| \(r_h\) | - | hydraulic radius | \(ft\) | \(m\) | \(m\) | - |
| \(r_h\) | - | hydraulic radius of a partially full pipe (less than half full) | \(in\) | \(mm\) | \(mm\) | - |
| \(r_h\) | - | hydraulic radius of a partially full pipe (more than half full) | \(in\) | \(mm\) | \(mm\) | - |
| \(r_h\) | - | hydraulic radius of a pipe | \(in\) | \(mm\) | \(mm\) | - |
| \(r_h\) | - | hydraulic radius of a rectangular channel | \(ft\) | \(m\) | \(m\) | - |
| \(r_h\) | - | hydraulic radius of a trapezoidal channel (equal side slopes) | \(ft\) | \(m\) | \(m\) | - |
| \(r_h\) | - | hydraulic radius of a rapezoidal channel (unequal side slopes) | \(ft\) | \(m\) | \(m\) | - |
| \(r_h\) | - | hydraulic radius of a triangular channel | \(ft\) | \(m\) | \(m\) | - |
| \(S\) | - | hydraulic slope | \(ft\) | \(m\) | \(m\) | - |
| \(H\) | - | hydrogen density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(H\) | - | hydrogen gas | - | - | - | - |
| \(HP\) | - | hydrostatic pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| \(HDS\) | - | hydrostatic stress | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg- m^{-1}-s^{-2}\) | - |
| - | - | hydrostatic weighting | - | - | - | - |
| \(\Delta \nu_{cs}\) | \nu | hyperfine transition frequency of 133Cs | \(Hz\) | \(Hz\) | \(s^{-1}\) | \(9\;192\;631\;770\) \(Hz\) |
| Symbol | Greek Symbol | Drfinition | English | Metric | SI | Value |
