# Formula Symbols - T

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

## Formula Symbols

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## T

SymbolGreek SymbolDefinitionEnglishMetricSIValue
$$a_t$$ - tangential acceleration $$\large{\frac{ft}{sec^2}}$$ $$\large{\frac{m}{s^2}}$$ $$m - s^{-2}$$ -
$$F_t$$ - tangential force $$lbf$$ $$N$$  $$kg - m - s^{-2}$$ -
$$v_t$$ - tangential velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m - s^{-1}$$ -
$$Ta$$ - Taylor number dimensionless -
$$TS$$ - tear strength $$\large{\frac{lbf}{in}}$$ $$\large{\frac{kg}{mm}}$$ $$kg - mm^{-1}$$ -
$$T$$ - temperature $$F$$ $$C$$ $$x+273.15\;K$$ -
$$\alpha$$, $$\;\beta$$ alpha, beta temperature coefficient $$F$$ $$C$$ $$x+273.15\;K$$ -
$$y$$ - temperature derating factor - - - -
$$T_d$$, $$\;\Delta T$$, $$\;TD$$ Delta temperature differential $$F$$ $$C$$ $$x+273.15\;K$$ -
$$\nabla T$$ nabla temperature gradient - - - -
$$T$$ - temperature of an ideal gas $$F$$ $$C$$ $$x+273.15\;K$$ -
$$\large{ \partial T }$$ partial temperature rate of change - - - -
$$V_{temp}$$ - temporary specific volume vatiable $$\large{\frac{ft^3}{lbm}}$$ $$\large{\frac{m^3}{kg}}$$ $$m^3 - kg^{-1}$$ -
$$T$$ - tensile force - - - -
$$T_{sat}$$ - temperature saturation point $$F$$ $$C$$ $$x+273.15\;K$$ -
$$s$$ - tensile strength  $$\large{\frac{lbf}{in^2}}$$ $$Pa$$  $$kg-m^{-1}-s^{-2}$$ -
$$f_t$$ - tensile strength of concrete  $$\large{\frac{lbf}{in^2}}$$ $$Pa$$  $$kg-m^{-1}-s^{-2}$$ -
$$\sigma$$ sigma tensile stress - - - -
$$T$$ - tension $$lbf$$ $$N$$  $$kg - m - s^{-2}$$ -
- - tension (change in dimension) - - - -
$$\sigma$$ sigma tension coefficient - - - -
$$F_t$$ - tension force - - - -
$$v_t$$ - terminal velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m - s^{-1}$$  -
$$C_t$$ - thermal capacitance $$\large{\frac{Btu}{F}}$$ $$\large{\frac{J}{K}}$$ $$J - K^{-1}$$   -
$$C$$ - thermal conductance of air space - - - -
$$Q$$ - thermal conduction - - - -
$$p$$ - thermal conduction rate - - - -
$$K$$, $$\;k$$ - thermal conductivity $$\large{\frac{Btu-ft}{hr-ft^2-F}}$$ $$\large{\frac{W}{m-K}}$$ $$W - m^{-1} -K^{-1}$$ -
$$\lambda$$ lambda thermal conductivity coefficient $$\large{\frac{Btu-ft}{hr-ft^2-F}}$$ $$\large{\frac{W}{m-K}}$$  $$W - m^{-1} -K^{-1}$$ -
$$k_t$$ - thermal conductivity constant $$\large{\frac{Btu-ft}{hr-ft^2-F}}$$  $$\large{\frac{W}{m-K}}$$ $$W - m^{-1} -K^{-1}$$ -
$$\lambda_{ik}$$ lambda thermal conductivity tensor - - - -
$$h_c$$ - thermal contact conductance coefficient - - - -
$$p$$ - thermal current - - - -
$$D_{td}$$ - thermal diffusion coefficient - - - -
$$\alpha_t$$ alpha thermal diffusion factor - - - -
$$k_t$$ - thermal diffusion ratio dimensionless -
$$\alpha$$ alpha thermal diffusivity $$\large{\frac{ft^2}{sec}}$$ $$\large{\frac{m^2}{s}}$$ $$m^2 - s^{-1}$$ -
$$T$$, $$\;\eta_{th}$$ eta thermal efficency dimensionless -
$$Q$$ - thermal energy $$Btu$$ $$\large{\frac{kg-m^2}{s^2}}$$  $$kg - m^2 - s^{-2}$$ -
$$\alpha$$, $$\;\alpha_c$$ alpha thermal expansion coefficient $$\large{ \frac{in}{in-F} }$$ $$\large{ \frac{mm}{mm -C} }$$ $$mm - mm^{-1} -C^{-1}$$ -
- - thermal expansion of gases - - - -
- - thermal expansion of liquids - - - -
- - thermal expansion of solids - - - -
$$\alpha$$ alpha thermal expansivity - - - -
$$l$$ - thermal intensity $$\large{\frac{Btu}{h-ft^2}}$$ $$\large{\frac{W}{m^2}}$$ $$W - m^{-2}$$ -
$$p$$ - thermal power transfer - - - -
$$R$$, $$\;R_t$$ - thermal resistance $$\large{\frac{hr-F}{Btu}}$$ $$\large{\frac{K}{W}}$$ $$K - W^{-1}$$ -
$$\epsilon_t$$ epsilon thermal strain - - - -
$$\sigma_T$$ sigma thermal stress $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N - mm^{-2}$$ -
$$\tau$$ tau thermal time constant $$sec$$ $$s$$ $$s$$ -
$$T$$, $$\;\tau$$ tau thermodynamic temperature - - - -
$$d$$, $$\;t$$, $$\;\delta$$ delta thickness $$ft$$ or $$in$$ $$m$$ or $$mm$$ $$m$$ or $$mm$$  -
$$t_f$$ - thickness of the flange of a steel beam cross-section $$in$$ $$mm$$ $$mm$$ -
$$t_w$$ - thickness of the web of a steel beam cross-section $$in$$ $$mm$$ $$mm$$ -
$$\mu$$ mu Thomson coefficient - - - -
$$\sigma_e$$ sigma Thomson cross section $$ft^2$$ $$m^2$$ $$m^2$$ $$6.652\;458\;7321\;(60)\;x\;10^{-29}$$ $$m^2$$
$$T$$ - throat size of a weld $$in$$ $$mm$$ $$mm$$ -
$$F$$ - thrust $$lbf$$ $$N$$  $$kg - m - s^{-2}$$ -
$$F$$ - thrust force $$lbf$$ $$N$$  $$kg - m - s^{-2}$$ -
$$t$$ - time $$sec$$ $$s$$ $$s$$ -
$$\tau$$ tau time constant $$sec$$ $$s$$ $$s$$ -
$$dt$$, $$\;\Delta t$$ Delta time differential $$sec$$ $$s$$ $$s$$ -
$$t_f$$ - time of flight $$sec$$ $$s$$ $$s$$ -
$$\Delta t$$ Delta time interval $$sec$$ $$s$$ $$s$$ -
$$t_p$$ - time of observation $$sec$$ $$s$$ $$s$$ -
$$t_c$$ - time of relaxation $$sec$$ $$s$$ $$s$$ -
$$T$$ - time scale - - - -
$$T$$, $$\;\tau$$ tau torque $$lbf-ft$$ $$N-m$$ $$kg-m^2-s^{-2}$$ -
$$T_s$$ - torque speed $$\large{\frac{lbf-ft}{sec}}$$ $$\large{\frac{J}{s}}$$   $$J - s^{-1}$$ -
$$T$$ - torsion (circle section) $$lbf-ft$$ $$N-m$$ $$kg-m^2-s^{-2}$$ -
$$J$$ - torsion constant for circle cross-section $$\large{\frac{lbf-ft}{rad}}$$ $$\large{\frac{N-m}{rad}}$$  $$N - m - rad^{-1}$$ -
$$J$$ - torsion constant for ellipse cross-section $$\large{\frac{lbf-ft}{rad}}$$ $$\large{\frac{N-m}{rad}}$$  $$N - m - rad^{-1}$$ -
$$J$$ - torsion constant for rectangle cross-section $$\large{\frac{lbf-ft}{rad}}$$ $$\large{\frac{N-m}{rad}}$$  $$N - m - rad^{-1}$$ -
$$J$$ - torsion constant for square cross-section $$\large{\frac{lbf-ft}{rad}}$$ $$\large{\frac{N-m}{rad}}$$  $$N - m - rad^{-1}$$ -
$$K$$ Kappa torsion coefficient - - - -
$$J$$ - torsional constant $$deg$$ $$rad$$ $$rad$$ -
$$K$$ - tortional stiffness constant - - - -
$$v$$ - Torricelli's law $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m - s^{-1}$$  -
$$k_r$$ - torsional spring constant $$\large{\frac{lbf-ft}{rad}}$$ $$\large{\frac{N-m}{rad}}$$  $$N - m - rad^{-1}$$ -
$$\tau$$ tau tortuosity dimensionless -
$$n$$ - total - - - -
$$J$$, $$\;j_i$$ - total angular momentum  $$\large{\frac{lbm-ft^2}{sec}}$$  $$\large{\frac{kg-m^2}{s}}$$   $$kg - m^2 - s^{-1}$$ -
$$\omega_t$$ omega total angular velocity $$\large{\frac{rad}{sec}}$$ $$\large{\frac{rad}{s}}$$  $$rad - s^{-1}$$ -
$$P$$ - total concentrated load $$lbm$$ $$N$$  $$kg - m - s^{-2}$$ -
$$h_d$$ - total discharge head $$ft$$ $$m$$ $$m$$ -
$$d_t$$ - total displacement $$ft$$ or $$in$$ $$m$$ or $$mm$$ $$m$$ or $$mm$$ -
$$TDH$$ - total dissolved head $$ft$$ $$m$$ $$m$$ -
$$TDS$$ - total dissolved solids $$ppm$$ $$\large{\frac{mg}{L}}$$  $$mg - L^{-1}$$ -
$$Q_n$$ - total energy $$lbf-ft$$ $$J$$ $$kg - m^2 - s^{-2}$$ -
$$h_t$$ - total head $$ft$$ $$m$$ $$m$$ -
$$Q_t$$ - total heat $$Btu$$ $$kJ$$ $$kJ$$  -
$$Q$$ - total heat transfer $$\large{\frac{Btu}{hr}}$$ $$W$$  $$kg - m^2 - s^{-2} - A^{-1}$$    -
$$W$$ - total load from a uniform distribution $$lbm$$ $$N$$  $$kg - m - s^{-2}$$ -
$$p_t$$ - total pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$ -
$$\eta_{tp}$$ eta total pump efficency dimensionless -
$$V$$ - total shear force - - - -
$$T_s$$ - total stagnation temperature $$F$$ $$C$$ $$x+273.15\;K$$ -
$$U$$ - total strain energy $$lbf-ft$$ $$J$$ $$kg - m^2 - s^{-2}$$ -
$$h_s$$   total suction head $$ft$$ $$m$$ $$m$$ -
$$T$$ - total term - - - -
$$t_t$$ - total time $$sec$$ $$s$$ $$s$$ -
$$V_t$$ - total velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$m - s^{-1}$$ -
$$V_t$$ - total volume of soil $$ft^3$$ $$m^3$$ $$m^3$$  -
$$W_t$$ - total weight of soil $$lbf$$ $$N$$ $$kg-m-s^{-2}$$ -
$$W_t$$ - total work $$lbf-ft$$ $$J$$ $$kg - m^2 - s^{-2}$$ -
- - trajectory of a projectile - - - -
- - trajectory of a projectile on a hill - - - -
$$\dot {t}$$ - transfer rate - - - -
$$TU$$ - transfer units - - - -
$$KE_t$$ - translational kinetic energy  -  - - -
$$\gamma$$ gamma transmissivity - - - -
$$T$$, $$\;\tau$$ tau transmittance dimensionless -
$$T$$ - transmitted torque $$lbf-ft$$ $$N-m$$ $$kg-m^2-s^{-2}$$ -
$$\tau$$ tau transmission coefficient - - - -
$$TL$$ - transmission loss $$dB$$ $$dB$$ $$dB$$  -
$$\Delta x$$ Delta transverse displacement - - - -
$$\epsilon_t$$ epsilon transverse strain (laterial strain) $$ft$$ $$m$$ $$m$$ -
$$T$$ - travel $$in$$ $$mm$$ $$mm$$ -
$$\epsilon$$ epsilon true strain $$\large{\frac{in}{in}}$$ $$\large{\frac{mm}{mm}}$$ $$mm - mm^{-1}$$ -
$$\sigma$$ sigma true stress $$\large{\frac{lbf}{in^2}}$$ $$MPa$$ $$N - mm^{-2}$$ -
$$Pr_t$$ - Turbulent Prandtl number dimensionless -
$$2D$$ - two-dimension - - - -
Symbol Greek Symbol Definition English Metric   Value

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