# Formula Symbols - B

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

## Formula Symbols

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## B

SymbolGreek SymbolDefinitionEnglishMetricSIValue
$$Ba$$ - Bagnold number dimensionless  -
$$Ba$$ - Barlow's formula $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$  -
$$b$$ - base - - -  -
$$\Delta$$ Delta beam deflection, an increment $$in$$ $$mm$$ $$mm$$  -
$$\Delta_{LL}$$ Delta beam deflection due to live load $$in$$ $$mm$$ $$mm$$  -
$$\Delta_{TL}$$ Delta beam deflection due to total load $$in$$ $$mm$$ $$mm$$  -
$$\Delta_{max}$$ Delta beam deflection maximum calculated $$in$$ $$mm$$ $$mm$$  -
$$\tau$$ tau beam shear stress $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$ -
$$A_p$$ - bearing area $$in^2$$ or $$ft^2$$ $$mm^2$$ or $$m^2$$ $$mm^2$$ or $$m^2$$  -
$$Be$$ - Bejan number dimensionless  -
$$b$$ - belt width $$in$$ $$mm$$ $$mm$$  -
$$BA$$ - bend allowance $$in$$ $$mm$$ $$mm$$ -
$$\theta$$ theta bend angle $$deg$$ $$rad$$ $$rad$$ -
$$BD$$ - bend deduction $$in$$ $$mm$$ $$mm$$ -
$$BM$$ - bending momernt $$\large{\frac{lbf}{sec}}$$ $$\large{\frac{kg-m}{s}}$$ $$kg - m - s^{-1}$$ -
$$\sigma_b$$ sigma bending stress $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$ -
$$Be$$ - Bernoulli's equation $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$ $$kg - m^{-3}$$  -
$$Bm$$ - Bingham number dimensionless  -
$$k_b$$ - binary rate coefficient - - -  -
$$Bi$$ - Biot number dimensionless  -
$$Bl$$, $$\;B$$ - Blake number dimensionless  -
$$u_k$$ - block wave function - - -  -
$$Bo$$, $$\;Bd$$ - Bodenstein number dimensionless  -
$$\mu_b$$ mu Bohr magneton - $$\large{ \frac{J}{T} }$$ $$J - T^{-1}$$   $$9.274\;009\;994\;(57)\;x\;10^{-24}$$ $$\large{ \frac{J}{T} }$$
$$a_o$$   Bohr radius $$ft$$ $$m$$ $$m$$ $$5.291\;772\;109 \;03\;x\;10^{-11}$$ $$m$$
$$k$$, $$\;k_b$$ - Boltzmann constant $$\large{ \frac{lbm-ft^2}{sec^2} }$$ $$\large{ \frac{kJ}{mol-K} }$$ $$kJ - mol^{-1} - K^{-1}$$  $$1.380\;648\;52 \;x \;10^{-23}$$ $$\large{ \frac{kJ}{mol-K} }$$
$$H$$ - Boltzmann function - - -  -
$$Bo$$ - Bond number dimensionless  -
$$\Delta E$$   Borda-Carnot equation $$lbf-ft$$ $$J$$ $$kg - m^2 - s^{-2}$$  -
$$BORE$$ - bore $$in$$ $$mm$$ $$mm$$  -
$$A$$ - bore factor - -    -
- - Boyles law $$\large{\frac{lbf}{in^2}}$$ $$\large{\frac{N}{m^2}}$$ $$N - m^{-2}$$  -
$$\upsilon$$ upsilon Bragg angle - - -  -
$$b$$ - brake dimension $$in$$ $$mm$$ $$mm$$  -
$$BHP$$, $$\;HP_b$$ - brake horsepower $$\large{\frac{lbf-ft}{sec}}$$ $$\large{\frac{J}{s}}$$ $$J - s^{-1}$$   -
$$BkW$$ - brake kilowatts - - -  -
$$B_r$$ - brake reaction distance $$ft$$ $$m$$ $$m$$ -
$$t$$ - brake reaction time $$sec$$ $$s$$ $$s$$ -
$$BSFC$$ - brake specific fuel consumption $$\large{\frac{lbm}{hp-hr}}$$ $$\large{\frac{kg}{kW-h}}$$ $$kg - kW^{-1} - h^{-1}$$  -
$$B_d$$ - braking distance $$ft$$ $$m$$ $$m$$ -
$$B_d$$ - Braking distance on grade $$ft$$ $$m$$ $$m$$ -
$$BHN$$, $$\;HB$$ - Brinell hardness number $$\large{\frac{lbm}{in^2}}$$ $$\large{\frac{kg}{mm^2}}$$ $$kg - mm^{-2}$$  -
$$Br$$ - Brinkman number dimensionless  -
- Brownell-Katz number dimensionless  -
$$k_{cr}$$ - buckling coefficient dimensionless -
$$Y$$ - bulk density $$\large{ \frac{lbm}{ft^3} }$$ $$\large{ \frac{kg}{m^3} }$$ $$kg - m^{-3}$$ -
$$B$$, $$\;K$$ - bulk modules $$\large{\frac{lbm}{in^2}}$$  $$Pa$$ $$kg- m^{-1}-s^{-2}$$  -
$$B$$, $$\;K$$ - bulk modules elasticity $$\large{\frac{lbm}{in^2}}$$  $$Pa$$ $$kg- m^{-1}-s^{-2}$$  -
$$\theta$$ theta bulk strain $$\large{\frac{in}{in}}$$  $$\large{\frac{mm}{mm}}$$  $$mm - mm^{-1}$$  -
$$T_b$$, $$\;T_{\infty}$$ - bulk temperature $$F$$ $$C$$ $$x+273.15\;K$$  -
$$\gamma '$$ gamma bulk unit weight $$\large{ \frac{lbm}{ft^3} }$$ $$\large{ \frac{N}{m^3} }$$ $$N - m^{-3}$$ -
$$B$$ - buoyancy $$lbf$$ $$N$$ $$kg - m - s^{-2}$$  -
$$B$$, $$\;F_b$$ - buoyancy force $$lbf$$ $$N$$ $$kg - m - s^{-2}$$  -
$$m_b$$ - buoyancy mass $$lbm$$ $$kg$$ $$kg$$  -
$$\gamma '$$ gamma buoyant unit weight $$\large{ \frac{lbm}{ft^3} }$$ $$\large{ \frac{N}{m^3} }$$ $$N- m^{-3}$$ -
$$b$$ - Burgers vector - - -  -
$$p_b$$ - burst pressure $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$  -
$$\sigma_{avg}$$ sigma buttweld under axial and transverse loading $$\large{\frac{lbf}{in^2}}$$ $$Pa$$ $$kg- m^{-1}-s^{-2}$$ -
$$BF$$ - bypass factor - - -  -
Symbol Greek Symbol Definition English Metric   Value

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