# Formula Symbols - F

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

SymbolGreek SymbolDefinitionUSMetric
$$K$$ - factor - -
$$FS$$ - factor of safety - -
$$n$$ - fan speed $$ft/sec$$ $$m/s$$
$$\tau$$ tau Fanning friction factor dimensionless number dimensionless number
$$Fa$$ - Faraday constant - $$C/mol$$
$$h$$ - film coefficient $$Btu/hr-ft^2-^\circ F$$ $$W/m^2\cdot K$$
$$h$$ - film thickness $$in$$ $$mm$$
$$l_f$$ - final length - -
$$x_f$$ - final position - -
$$T_f$$ - final temperature - -
$$t_f$$ - final time - -
$$v_f$$ - final velocity - -
$$V_f$$ - final volume - -
$$q$$ - flow - $$m^3/s$$
$$C_v$$ - flow coefficient - -
$$Q$$ - flow rate $$gal/min$$ -
$$Q_w$$ - flow rate of water $$gal/min$$ -
$$u$$ - fluid velocity $$ft/sec$$ $$m/s$$
$$F$$ - force $$lbf$$ $$N$$
$$\Delta F$$ delta force differential $$lbf$$ $$N$$
$$F_d$$ - force differential $$lbf$$ $$N$$
$$F$$ - formality - $$FW/L$$
$$FW$$ - formula weight $$lbm/lbmol$$ $$kg/kmol$$
$$Fo$$ - Fourier Number - -
$$x$$ - fraction - -
$$f$$ - fraction split - -
$$f$$ - frequency $$Hz$$ $$HZ$$
$$\nu$$ nu frequency $$Hz$$ $$HZ$$
$$f$$ - friction - $$N$$
$$\mu$$ mu friction coefficient dimensionless number dimensionless number
$$f$$ - friction factor - -
$$F_f$$ - friction Force - -
$$FHP$$ - friction horsepower $$hp$$ -
$$FP$$ - friction pressure $$in \; wg$$ $$Pa$$
$$f$$ - frequency $$Hz$$ $$HZ$$
$$\nu$$ nu frequency $$Hz$$ $$HZ$$
$$Fo$$ - Fourier number dimensionless number dimensionless number
$$Fr$$ - Froude number dimensionless number dimensionless number
$$FAR$$ - fuel-air ratio $$lbm/lbm$$ $$kg/kg$$
$$m_f$$ - fuel mixture - -
$$f$$ - function - -