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"P" 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 |
| \(\partial\) | partial | partial derivative | - | - | - | - |
| \(\rho_p\) | rho | particle density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(d_p\) | - | particle diameter | - | \(nm\) | \(nm\) | - |
| \(m_p\) | - | particle mass | \(lbm\) | \(kg\) | \(kg\) | - |
| \(R\), \(\;r\) | - | particle position vector | - | - | - | - |
| \(p_w\) | - | partial pressure of water vapot in moist air | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\Delta p\) | - | Pascal's law | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(PSD\) | - | passing sight distance | \(ft\) | \(m\) | \(m\) | - |
| \(Pe\) | - | Peclet number | dimensionless | dimensionless | dimensionless | - |
| \(N_p\) | - | Peel number | dimensionless | dimensionless | dimensionless | - |
| \(P\) | - | perimeter | \(ft\) | \(m\) | \(m\) | - |
| \(T\) | - | period | - | - | - | - |
| \(T\) | - | periodic time | - | - | - | - |
| \(PF\) | - | performance factor | - | - | - | - |
| \(PN\) | - | performance number | - | - | - | - |
| \(\mu\) | mu | permeability | \(ft^2\) | \(m^2\) | \(m^2\) | - |
| \(k\) | - | permeability coefficient | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(\mu_o\) | mu | permeability of vacuum | - | \(\large{\frac{H}{m}}\) | \(H-m^{-1}\) | \(1.256\;637\;062\;12\;(19)\;x\;10^{-6}\) \(\large{\frac{H}{m}}\) |
| \(\epsilon\) | epsilon | permittivity | - | \(\large{\frac{F}{m}}\) | \(H-m^{-1}\) | - |
| \(\epsilon_o\) | epsilon | permittivity of vacuum | - | \(\large{\frac{F}{m}}\) | \(H-m^{-1}\) | \(8.854\;187\;8128\;(13)\;x\;10^{-12}\) \(\large{\frac{F}{m}}\) |
| \(p\) | - | Peng-Robinson equation of state | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(y\) | - | perpendicular distance to the neutral axis | \(in\) | \(mm\) | \(mm\) | - |
| \(r_{\perp}\) | - | perpendicular radius | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(pH\) | - | ph | dimensionless | dimensionless | dimensionless | - |
| \(\gamma \) | gamma | photon | - | - | - | - |
| \(\pi\) | pi | Pi | dimensionless constant | dimensionless constant | dimensionless constant | \(3.141\;592\;653 ...\) |
| \(C\) | - | Pierce parameter | dimensionless | dimensionless | dimensionless | - |
| \(n_{pig}\) | - | pigging efficiency | dimensionless | dimensionless | dimensionless | - |
| \(d\), \(\;d_p\) | - | pipe inside diameter ID | \(in\) | \(mm\) | \(mm\) | - |
| \(l\), \(\;l_p\) | - | pipe length | \(ft\) | \(m\) | \(m\) | - |
| \(t\), \(\;t_p\) | - | pipe thickness | \(in\) | \(mm\) | \(mm\) | - |
| \(W_p\) | - | pipe weight | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(\rho\) | rho | pipeline parameter | dimensionless | dimensionless | dimensionless | - |
| \(F_p\) | - | piping geometry factor | dimensionless | dimensionless | dimensionless | - |
| \(PDV\) | - | piston deck volume | \(in^3\) | \(cc^3\) | \(cc^3\) | - |
| \(p\) | - | pitch | \(in\) | \(mm\) | \(mm\) | - |
| \(q_p\) | - | Planck change | \(ft\) | \(m\) | \(m\) | \(1.88\;x\;10^{-18}\) \(m\) |
| \(Pl\), \(\;h\) | - | Planck constant | \(\large{\frac{lbf-ft}{sec}}\) | \(J-s\) | \(kg-m^2-s^{-1}\) | \(6.626\;0693\;(11)\;x\;10^{-34}\) \(J-s\) |
| \(E_p\) | - | Planck energy | \(lbf-ft\) | \(J\) | \(kg-m^2-s^{-2}\) | \(1.96\;x\;10^{9}\) \(J\) |
| \(Y\) | - | Planck function | - | - | - | - |
| \(l_p\) | - | Planck length | \(ft\) | \(m\) | \(m\) | \(1.616\;24\;(12)\;x\;10^{-35}\) \(m\) |
| \(m_p\) | - | Planck mass | \(lbm\) | \(kg\) | \(kg\) | \(2.176\;45\;(16)\;x\;10^{-8}\) \(kg\) |
| \(T_p\) | - | Planck temperature | \(F\) | \(K\) | \(x-273.15\;C\) | \(1.416\;79\;(11)\;x\;10^{32}\) \(K\) |
| \(t_l\) | - | Planck time | \(sec\) | \(s\) | \(s\) | \(5.39\;21\;(40)\;x\;10^{-44}\) \(s\) |
| \(\alpha\), \(\;\beta\), \(\;\gamma\), \(\;\theta\), \(\;\phi\) | alpha, beta, gamma, theta, phi | plane angle | \(deg\) | \(rad\) | \(rad\) | - |
| \(p\) | - | plasma pressure | - | - | - | - |
| \(PI\) | - | plastic index | dimensionless | dimensionless | dimensionless | - |
| \(PL\) | - | plastic limit | dimensionless | dimensionless | dimensionless | - |
| \(Z\) | - | plastic section modulus | \(in^3\) | \(mm^3\) | \(mm^3\) | - |
| \(b\) | - | plate long side dimension | \(ft\) | \(m\) | \(m\) | - |
| \(a\) | - | plate short side dimension | \(ft\) | \(m\) | \(m\) | - |
| \(A,\;B,\;C,\;D,\;E\) | - | point of intersect on frame | dimensionless | dimensionless | dimensionless | - |
| \(O\) | - | point of origin | - | - | - | - |
| \(v\) | - | Poiseuille's equation for compressible fluids | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(\mu\) | mu | Poisson's ratio | dimensionless | dimensionless | dimensionless | - |
| \(J\) | - | polar moment of inertia | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(J\) | - | polar area moment of inertia | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(e\) | - | polarization vector | - | - | - | - |
| \(V\) | - | pollution emission rate | \(\large{\frac{ft^3}{hr}}\) | \(\large{\frac{m^3}{h}}\) | \(m^3-h^{-1}\) | - |
| \(n\) | - | polytropic exponent | dimensionless | dimensionless | dimensionless | - |
| \(J\) | - | polar moment of inertia | \(in^4\) | \(m^4\) | \(m^4\) | - |
| \(P\), \(\;\phi\), \(\;n\) | phi | porosity | dimensionless | dimensionless | dimensionless | - |
| \(\phi\) | phi | porous media | - | - | - | - |
| \(x\) | - | position | - | - | - | - |
| \(x_d\), \(\;\Delta x\) | Delta | position differential | - | - | - | - |
| \(U\), \(\;V\) | - | potential difference | - | - | - | - |
| \(PE\), \(\;E_p\) | - | potential energy | \(lbf-ft\) | \(J\) | \(kg-m^2-s^{-2}\) | - |
| \(E_z\) | - | potential energy of a fluid at an elevation | \(lbf-ft\) | \(J\) | \(kg-m^2-s^{-2}\) | - |
| \(P\) | - | power (electric) | \(\large{\frac{lbf-ft}{sec}}\) | \(W\) | \(kg-m^2-s^{-3}\) | - |
| \(pf\) | - | power factor | dimensionless | dimensionless | dimensionless | - |
| \(W\) | - | power jack load | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \( N_p\) | - | Power number | dimensionless | dimensionless | dimensionless | - |
| \( PTR\) | - | power-to-heat ratio | dimensionless | dimensionless | dimensionless | - |
| \(Pr\) | - | Prandtl number | dimensionless | dimensionless | dimensionless | - |
| \(\beta\) | beta | Prater number | dimensionless | dimensionless | dimensionless | - |
| \(p\) | - | pre-ignition cylinder pressure of an engion | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\;p\) | - | pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\phi\) | - | pressure angle | \(deg\) | \(rad\) | \(rad\) | - |
| \(C_p\), \(\;\beta\) | beta | pressure coefficient | dimensionless | dimensionless | dimensionless | - |
| \(p_d\), \(\;\Delta p\) | Delta | pressure differential | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(x_T\) | - | pressure differential ratio factor | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\Delta p\) | Delta | pressure drop | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(PG\) | - | pressure gradient | \(\large{\frac{psi}{ft}}\) | \(\large{\frac{Pa}{m}}\) | \(Pa-m^{-1}\) | - |
| \(p\) | - | pressure gauge | \(psig\) | \(kPa\) | \(kPa\) | - |
| \(p_{inc}\) | - | pressure increase | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\Delta P\) | - | pressure loss | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\Delta P_f\) | - | pressure loss due to friction | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(p\) | - | pressure of an ideal gas | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(F_L\) | - | pressure recovery factor | - | - | - | - |
| \(P\) | - | pressure scale | - | - | - | - |
| \(\alpha\), \(\;\alpha_p\) | alpha | pressure wave velocity | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(S\) | - | probability current density | - | - | - | - |
| \(P\) | - | probability density | - | - | - | - |
| \(\propto\) | propto | proportional to | - | - | - | - |
| \(p\) | - | proton | - | - | - | - |
| proton g-factor | dimensionless constant | dimensionless constant | dimensionless constant | \(5.585\;694\;713\) | ||
| \(a_{gp}\) | - | proton gravitational coupling constant | dimensionless constant | dimensionless constant | dimensionless constant | \(8.09\;x\;10^{-37}\) |
| \(m\) | - | proton magnetic moment | - | - | - | - |
| \(m_p\) | - | proton mass | \(lbm\) | \(kg\) | \(kg\) | \(1.672\;621\;923\;69(51)\;x\;10^{-27}\) \(kg\) |
| \(m_p c^2\) | - | proton rest energy | \(MeV\) | \(MeV\) | \(MeV\) | \(938.272\;088\;16(29)\) \(MeV\) |
| \(m_p\) | - | proton rest mass | \(lbm\) | \(kg\) | \(kg\) | \(1.672\;621\;923\;69(51)\;x\;10^{-27}\) \(kg\) |
| \(\eta\) | eta | pulley efficiency | - | - | - | - |
| \(\epsilon\) | epsilon | pulley loss factor | - | - | - | - |
| \(\eta_p\) | eta | pump efficiency | dimensionless | dimensionless | dimensionless | - |
| \(PHP\), \(HP_p\) | - | pump horsepower | \(\large{\frac{lbf-ft}{sec}}\) | \(\large{\frac{Btu}{s}}\) | \(Btu-s^{-1}\) | - |
| \(n\) | - | pump speed | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
