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Formula Symbols - P

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

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P

SymbolGreek SymbolDefinitionUSMetricValue
\(\partial\) partial partial derivative - - -
\(\rho_p\) rho particle density \(lb\;/\;ft^3\) \(kg\;/\;m^3\)  -
\(d_p\) - particle diameter - \(nm\)  -
\(m_p\) - particle mass \(lb\) \(kg\)  -
\(R\), \(\;r\) - particle position vector - -  -
\(PSD\) - passing sight distance \(ft\) \(m\) -
\(Pe\) - Peclet number dimensionless dimensionless  -
\(N_p\) - Peel number dimensionless dimensionless  -
\(P\) - perimeter \(ft\) \(m\)  -
\(T\) - period - -  -
\(T\) - periodic time - -  -
\(PF\) - performance factor - -  -
\(PN\) - performance number - -  -
\(\mu\) mu permeability  \(ft^2\) \(m^2\)  -
\(K\) - permeability coefficient - - -
\(\mu_o\) mu permeability of vacuum constant constant  \(12.566\;370\;614\;359...\;x\;10^{-7}\;kg\;m\;s^{-2}\;A^{-2}\)
\(\epsilon\) epsilon permittivity - \(F\;/\;m\)  -
\(\epsilon_o\) epsilon permittivity of vacuum constant constant  \(8.854\;187\;817\;620...\;x\;10^{-12}\;kg^{-1}\;m^{-3}\;s^4\;A^2\)
\(y\) - perpendicular distance to the neutral axis \(in\) \(mm\) -
\(r_{\perp}\) - perpendicular radius \(in\;or\;ft\) \(mm\;or\;m\) -
\(pH\) - ph dimensionless dimensionless  -
\(\gamma \) gamma photon - -  -
\(\pi\) pi Pi dimensionless constant dimensionless constant  \(3.141 592 653 589 793...\)
\(C\) - Pierce parameter dimensionless dimensionless  -
\(d\), \(\;d_p\) - pipe inside diameter ID \(in\) \(mm\)  -
\(l\), \(\;l_p\) - pipe length \(ft\) \(m\) -
\(t\), \(\;t_p\) - pipe thickness \(in\) \(mm\)  -
\(W_p\) - pipe weight \(lb\;/\;ft\) \(kg\;/\;m\)  -
\(F_p\) - piping geometry factor dimensionless dimensionless  -
\(PDV\) - piston deck volume \(in^3\) \(cc^3\)  -
\(p\) - pitch \(in\) \(mm\) -
\(Pl\), \(\;h\) - Planck constant constant constant \(6.626\;070\;15\; x\;10^{-34}\;J\;s\)
\(Y\) - Planck function constant constant  -
\(q_p\) - Planck change constant constant \(1.8755\;x\;10^{-18}\;m\)
\(l_p\) - Planck length constant constant \(1.6162\;x\;10^{-35}\;m\)
\(m_p\) - Planck mass constant constant \(2.1765\;x\;10^{-8}\;kg\) 
\(T_p\) - Planck temperature constant constant \(1.416\;785\;x\;10^{32}\;k\)
\(t_l\) - Planck time constant constant \(5.3912\;x\;10^{-44}\;s\) 
\(\alpha\), \(\;\beta\), \(\;\gamma\), \(\;\theta\), \(\;\phi\) alpha, beta, gamma, theta, phi plane angle \(deg\) \(rad\)  -
\(p\) - plasma pressure - -  -
\(Z\) - plastic section modulus \(in^2\) \(mm^2\)  -
\(b\) - plate long side dimension \(ft\) \(m\)  -
\(a\) - plate short side dimension \(ft\) \(m\)  -
\(O\) - point of origin - -  -
\(Po\), \(\;\mu\), \(\;\nu\) mu, nu Poisson's ratio - -  -
\(J\) - polar area moment of inertia \(ft^4\) \(m^4\)  -
\(e\) - polarization vector - -  -
\(n\) - polytropic exponent - -  -
\(J\) - polar moment of inertia \(in^4\) \(m^4\)  -
\(P\), \(\;\phi\), \(\;n\) phi porosity dimensionless dimensionless  -
\(\phi\) phi porous media - -  -
\(x\) - position - -  -
\(x_d\), \(\;\Delta x\) Delta position differential - -  -
\(U\), \(\;V\) - potential difference - -  -
\(PE\), \(\;E_p\) - potential energy \(ft-lbf\) \(J\)  -
\(P\) - power \(lbf\;/\;sec\) \(W\)  -
\(P\) - power \(HP\) \(W\)  -
\(P\) - power \(Btu \;/\; sec\) \(kW\)  -
\(pf\) - power factor dimensionless dimensionless  -
\(W\) - power jack load \(lbf\) \(N\)  -
\( N_p\) - Power number dimensionless dimensionless  -
\( PTR\) - power-to-heat ratio - -  -
\(Pr\) - Prandtl number dimensionless dimensionless  -
\(\beta\) beta Prater number dimensionless dimensionless  -
\(\;p\) - pressure \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(\phi\) - pressure angle \(deg\) \(deg\)  -
\(C_p\), \(\;\beta\) beta pressure coefficient dimensionless dimensionless  -
\(p_d\), \(\;\Delta p\) Delta pressure differential \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(x_T\) - pressure differential ratio factor \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(\Delta p\) Delta pressure drop \(lb\;/\;in^2 \;or\; psi\) \(Pa\) -
\(PG\) - pressure gradient \(psi\;/\;ft\) \(kPa\;/\;m\)  -
\(p_{inc}\) - pressure increase \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(\Delta P\) - pressure loss \(lb\;/\;in^2 \;or\; psi\) \(Pa\) -
\(\Delta P_f\) - pressure loss due to friction \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(F_L\) - pressure recovery factor - -  -
\(P\) - pressure scale - - -
\(\alpha\), \(\;\alpha_p\) alpha pressure wave velocity \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(S\) - probability current density - -  -
\(P\) - probability density - -  -
\(\propto\) propto proportional to - -  -
\(p\) - proton - -  -
    proton g-factor dimensionless constant dimensionless constant \(5.585\;694\;713\)
\(a_{gp}\) - proton gravitational coupling constant dimensionless constant dimensionless constant \(8.09\;x\;10^{-37}\)
    proton magnetic moment constant constant \(1.410\;606\;743\;x\;10^{-26}\;m^2\;A\)
\(mc^2\) - proton rest energy constant constant \(1.503\;277\;484\;x\;10^{-10}\;kg\;m^2\;s^{-2}\)
\(m_p\) - proton rest mass constant constant \(1.672\;621\;923\;69\;x\;10^{-27}\;kg\)
\(\eta\) eta pulley efficiency - -  -
\(\epsilon\) epsilon pulley loss factor - -  -
\(PHP\), \(HP_p\) - pump horsepower \(hp\) - -
\(n\) - pump speed \(rpm\) \(rpm\)  -
Symbol Greek Symbol Definition US Metric Value

 

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