# Formula Symbols - T

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

For other symbols see:  A - 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

SymbolGreek SymbolDefinitionUSMetric
$$a_t$$ - tangential acceleration - -
$$v_t$$ - tangential velocity $$rad\;/\;s$$ $$rad\;/\;s$$
$$Ta$$ - Taylor number dimensionless number dimensionless number
$$T$$ - temperature $$^\circ F$$ $$^\circ C$$
$$\alpha \;,\; \beta$$ alpha , beta temperature coefficient $$1 \;/\; ^\circ R$$ $$1 \;/\; K$$
$$y$$ - temperature derating factor - -
$$T_d \;,\; \Delta T$$ Delta temperature differential $$^\circ F$$ $$^\circ C$$
$$\nabla T$$ nabla temperature gradient - $$Km^{-1}$$
$$T$$ - tension $$lbf$$ $$N$$
$$F_t$$ - tension force - -
$$v_t$$ - terminal velocity - -
$$C_t$$ - thermal capacitance $$Btu\;/\;^oF$$ $$J\;/\;K$$
$$C$$ - thermal conductance of air space $$Btu\;/\;ft^2-hr -^\circ F$$ $$W\;/\;m^2 \cdot ^\circ C$$
$$Q$$ - thermal conduction - -
$$p$$ - thermal conduction rate - -
$$K \;,\; k$$ - thermal conductivity $$Btu-ft\;/\;hr-ft^2-^\circ F$$ $$W\;/\;m\cdot K$$
$$\lambda$$ lambda thermal conductivity coefficient $$Btu-ft\;/\;hr-ft^2-^\circ F$$ $$W\;/\;m\cdot K$$
$$k_t$$ - thermal conductivity constant - -
$$\lambda_{ik}$$ lambda thermal conductivity tensor - -
$$p$$ - thermal current - -
$$D_{td}$$ - thermal diffusion coefficient - -
$$\alpha_t$$ alpha thermal diffusion factor - -
$$k_t$$ - thermal diffusion ratio - -
$$a$$ - thermal diffusivity $$ft^2\;/\;sec$$ $$m^2 \;/\;s$$
$$Q$$ - thermal energy - -
$$\alpha$$ alpha thermal expansion coefficient - $$K_{-1}$$
$$l$$ - thermal intensity - $$Wm^{-2}$$
$$p$$ - thermal power transfer - -
$$R_t$$ - thermal resistance $$hr-^\circ F\;/\;Btu$$ $$K\;/\;W$$
$$\tau$$ tau thermal time constant $$hr$$ $$s$$
$$T \;,\; \tau$$ tau thermodynamic temperature - -
$$d \;,\; \delta$$ delta thickness $$in\;$$ or $$\; ft$$ $$m$$
$$\mu$$ mu Thomson coefficient - -
$$\sigma_e$$ sigma Thomson cross section - -
$$F$$ - thrust $$lbf$$ $$N$$
$$F$$ - thrust force $$lbf$$ $$N$$
$$t$$ - time $$hr$$ $$s$$
$$\tau$$ tau time constant $$m$$ $$s$$
$$t_d \;,\; \Delta t$$ Delta time differential $$hr$$ $$s$$
$$t_f$$ - time of flight $$hr$$ $$s$$
$$T \;,\; \tau$$ tau torque $$in-lbf$$ $$N\cdot m$$
$$K$$ Kappa torsion coefficient - $$N \cdot m\;/\;rad$$
$$k_r$$ - torsional spring constant $$ft-lbf\;/\;rad$$ $$N \cdot m\;/\;rad$$
$$n$$ - total - -
$$J \;,\; j_i$$ - total angular momentum - -
$$TDH$$ - total dissolved head $$ft$$ $$m$$
$$TDS$$ - total dissolved solids $$ppm$$ $$mg\;/\;L$$
$$h_t$$ - total head $$ft$$ $$m$$
$$q_t$$   total heat $$Btu$$ $$kJ$$
$$p_t$$ - total pressure $$in\; wg$$ $$Pa$$
$$T$$ - total term - -
$$W_t$$ - total work $$ft-lbf$$ $$kW$$
$$\dot {t}$$ - transfer rate - -
$$TU$$ - transfer units - -
$$\gamma$$ gamma transmissivity - -
$$\tau$$ tau transmittance - -
$$T$$ - transmitted torque $$ft-lbf$$ $$N \cdot m$$
$$\tau$$ tau transmission coefficient - -
$$\epsilon$$ epsilon true strain $$in\;/\;in$$ $$m\;/\;m$$
$$\sigma$$ sigma true stress $$lbf\;/\;in^2$$ $$MPa$$
$$Pr_t$$ - Turbulent Prandtl number dimensionless number dimensionless number