## Nomenclature & Symbols for Engineering, Mathematics, and Science

Formula nomenclature is a system of names or terms represented by letters and the Greek alphabet assigned to represent equation physical quantities.  Definition symbols vary widely and do not necessarily represent the information being presented the way an abbreviation does.  These alphabetical lists contain symbols, greek symbols, definitions, US units, metric units, dimensionless numbers, constants, and constant values.

## Unit Equalities

Symbol English Metric SI
Ampere  -  $$A$$, $$\;I$$
-  $$I$$  =  $$\large{\frac{C}{s}}$$  $$C - s^{-1}$$
Btu  -  $$Btu$$  $$Btu$$  =  $$lbf-ft$$  $$Btu$$  =  $$J$$  =  $$kJ$$  =  $$W-h$$  $$J$$
Celsius  -  $$C$$  -  $$C$$   $$x+273.15\;K$$
Coulomb  -  $$C$$  -  $$C$$  =  $$A-s$$   $$A-s$$
Farad  -  $$F$$  -  $$F$$  =  $$\large{\frac{s^4-A^2}{kg-m^2}}$$  =  $$\large{\frac{S^2-C^2}{kg-m^2}}$$  =  $$\large{\frac{C}{V}}$$  =  $$\large{\frac{A-s}{V}}$$  =  $$\large{\frac{W-s}{V^2}}$$  =  $$\large{\frac{J}{V^2}}$$  =  $$\large{\frac{N-m}{V^2}}$$  =  $$\large{\frac{C^2}{J}}$$  =  $$\large{\frac{C^2}{N-m}}$$  =  $$\large{\frac{S}{\Omega}}$$  =  $$\large{\frac{1}{\Omega-Hz}}$$  =  $$\large{\frac{S}{Hz}}$$  =  $$\large{\frac{s^2}{H}}$$  $$s^4-A^2-kg^{-1}-m^{-2}$$
Gauss -  $$G$$  -  $$G$$  =  $$\large{\frac{T}{10^4}}$$  =  $$Mx-cm^2$$  =  $$\large{\frac{g}{Bi-s^2}}$$  $$T-10^{-4}$$
Henry -  $$H$$  -  $$H$$  =  $$\large{\frac{kg-m^2}{s^2-A^2}}$$  =  $$\large{\frac{N-m}{A^2}}$$  =  $$\large{\frac{kg-m^2}{C^2}}$$  =  $$\large{\frac{J}{A^2}}$$  =  $$\large{\frac{T-m^2}{A}}$$  =  $$\large{\frac{Wb}{A}}$$  =  $$\large{\frac{V-s}{A}}$$  =  $$\large{\frac{s^2}{F}}$$  =  $$\large{\frac{\Omega}{Hz}}$$  =  $$\Omega-s$$  $$kg-m^2-s^{-2}-A^{-2}$$
Hertz -  $$Hz$$  -  $$Hz$$  =  $$s^{-1}$$ (one cycle per sec)  $$s^{-1}$$
Horespower -  $$hp$$  $$hp$$  $$hp$$  =  $$W$$  $$W$$
Joule -  $$J$$  $$lbf-ft$$  $$J$$  =  $$\large{\frac{kg-m^2}{s^2}}$$  =  $$N-m$$  =  $$Pa-m^3$$  =  $$W-s$$  =  $$C-V$$  =  $$\Omega-A^2-s$$  $$kg-m^2-s^{-2}$$
Joule-sec -  $$J-s$$  $$\large{\frac{lbf-ft}{sec}}$$  $$J-s$$  =  $$\large{\frac{kg-m^2}{s}}$$  $$kg-m^2-s^{-1}$$
Kelvin -  $$K$$  -  $$K$$  $$x-273.15\;C$$
Maxwell -  $$Mx$$  -  $$Mx$$  =  $$\large{\frac{Wb}{10^{8}}}$$  =  $$\large{\frac{G}{cm^2}}$$  $$Wb-10^{-8}$$
Newton -  $$N$$  $$lbf$$  $$N$$  =  $$\large{\frac{kg-m}{s^2}}$$  $$kg-m-s^{-2}$$
Newton-meter -  $$N-m$$  $$lbf-ft$$  $$N-m$$  =  $$\large{\frac{kg-m^2}{s^2}}$$  $$kg-m^2-s^{-2}$$
Ohm -  $$(\Omega)$$, $$\;(R)$$  -  $$\Omega$$  =  $$\large{\frac{kg-m^2}{s^3-A^2}}$$  =  $$\large{\frac{kg-m^2}{s-C^2}}$$  =  $$\large{\frac{J}{s-A^2}}$$  =  $$\large{\frac{V}{A}}$$  =  $$\large{\frac{1}{S}}$$  =  $$\large{\frac{W}{A^2}}$$  =  $$\large{\frac{V^2}{W}}$$  =  $$\large{\frac{s}{F}}$$  =  $$\large{\frac{H}{s}}$$  =  $$\large{\frac{J-s}{C^2}}$$ $$kg-m^2-s^{-3}-A^{-2}$$
Poise -  $$P$$   $$\large{\frac{lbf}{ft-sec}}$$  $$P$$  =  $$\large{\frac{kg}{0.1\;m-s}}$$  =  $$1\;dyn-s-cm^2$$  =  $$\large{\frac{N-s}{m^2}}$$  $$kg-0.1\;m^{-1}-s^{-1}$$
Pascal -  $$Pa$$   $$\large{\frac{lbf}{in^2}}$$  $$Pa$$  =  $$\large{\frac{kg}{m-s^2}}$$  =  $$\large{\frac{N}{m^2}}$$  =  $$\large{\frac{J}{m^3}}$$  $$kg-m^{-1}-s^{-2}$$
Pascal-sec -  $$Pa-s$$   $$\large{\frac{lbf-sec}{ft^2}}$$  $$Pa-s$$  =  $$\large{\frac{kg}{m-s}}$$  =  $$\large{\frac{N-s}{m^2}}$$  =  $$10\;P$$  $$kg-m^{-1}-s^{-1}$$
MegaPascal -  $$MPa$$   $$\large{\frac{lbf}{in^2}}$$  $$MPa$$  =  $$\large{\frac{N}{mm^2}}$$  $$N-mm^{-2}$$
Siemens -  $$S$$  -  $$S$$  =  $$\large{\frac{s^3-A^2}{kg-m^2}}$$ $$s^3-A^2-kg^{-1}-m^{-2}$$
Tesla -  $$T$$  -  $$T$$  =  $$\large{\frac{kg}{s^2-A}}$$  =  $$\large{\frac{V-s}{m^2}}$$  =  $$\large{\frac{N}{A-m}}$$  =  $$\large{\frac{J}{A-m^2}}$$  =  $$\large{\frac{H-A}{m^2}}$$  =  $$\large{\frac{Wb}{m^2}}$$  =  $$\large{\frac{kg}{C-s}}$$  =  $$\large{\frac{N-s}{C-m}}$$  =  $$\large{\frac{kg}{A-s^2}}$$  $$kg-s^{-2}-A^{-1}$$
Torr -  $$Torr$$  -  $$Torr$$  =  $$Pa$$  $$kg-m^{-1}-s^{-2}$$
Volt -  $$V$$  -

$$V$$  =  $$\large{\frac{kg-m^2}{s^{3}-A}}$$  =  $$A-\Omega$$  =  $$\large{\frac{Wb}{s}}$$  =  $$\large{\frac{W}{A}}$$  =  $$\large{\frac{J}{C}}$$  =  $$\large{\frac{eV}{e}}$$

• eV = electronvolt
• e = elementary charge
$$kg-m^2-s^{-3}-A^{-1}$$
Watt -  $$(W)$$, $$\;(P)$$  $$\large{\frac{lbf-ft^2}{ssec^3}}$$  $$W$$  =  $$\large{\frac{kg-m^2}{s^3}}$$  =  $$\large{\frac{J}{s}}$$  =  $$\large{\frac{N-m}{s}}$$  $$kg-m^2-s^{-3}$$
Weber -  $$Wb$$  $$\large{\frac{V}{sec}}$$  $$Wb$$  =  $$\large{\frac{kg-m^2}{s^2-A}}$$  =  $$\large{\frac{N-m}{A}}$$  =  $$\large{\frac{J}{A}}$$  =  $$\Omega-C$$  =  $$V-s$$  =  $$H-S$$  =  $$T-m^2$$  =  $$10^8-Mx$$  $$kg-m^2-s^{-2}-A^{-1}$$
Unit  -  Symbol  English Metric  SI

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Title
Formula Symbols - I
Formula Symbols - J
Formula Symbols - K
Formula Symbols - L
Formula Symbols - M