| e = 2.71828 | Base of natural logarithm |
| i = √-1 | Square root of -1 |
| π = 3.14159 | Pi |
| ε0 = 8.854 x 10-14 F/cm | Permittivity of free space |
| k = 8.61733 x 10-5 eV/K | Boltzmann’s constant |
| q = 1.602 x 10-19 C | Magnitude of electronic charge |
| f | Frequency (cycles/s or Hz) |
| ω = 2πf | Angular frequency (radians/s) |
| q | Charge (coulomb) |
| t | Time (s) |
| σ | Conductivity (ohm-1-cm-1) |
| ρ = 1/σ | Resistivity, or ion viscosity (ohm-cm) |
| ε | Permittivity (F/cm) |
| ε* = ε0 (ε’ – iε”) | Permittivity as a complex quantity (F/cm) |
| κ = ε’ – iε” | Relative permittivity* or dielectric constant (unitless) |
| ε’ = Re(ε*/ε0) | Relative permittivity* or dielectric constant (unitless) |
| ε” = Im(ε*/ε0) = σ /ωε0 | Loss factor or loss index (unitless) |
| D = tan δ = ε”/ε’ | Dissipation factor or loss tangent (unitless) |
| δ = tan-1(ε”/ε’) | Delta (unitless) |
| δ ~ ε”/ε’ | Delta for small ε”/ε’ (unitless) |
| A/D | Ratio of electrode area to distance between Parallel plate electrodes (cm) |
| V | Voltage (volt) |
| I = q/t | Current (amp) |
| C = q/V | Capacitance (farad) |
| G = I/V | Conductance (ohm-1) |
| R = V/I = 1/G | Resistance (ohm) |
| C = ε0ε’A/D | Capacitance (farad) |
| G = σ A/D | Conductance (siemens or ohm-1) |
| R = ρ /(A/D) | Resistance (ohm) |
| Y = G + iωC | Admittance (siemens or ohm-1) |
| Z = 1/Y = 1/(G + iωC) | Impedance (ohm) |
| α | Degree of cure (unitless, between 0 and 1) |
| αmax | Maximum degree of cure at cure temperature |
| Mw | Molecular weight (gm/mole) |
| Mw0 | Molecular weight at α = 0 (uncured) |
| Mw∞ | Molecular weight at α = 1 (fully cured) |
| TCure | Cure or process temperature (K or °C) |
| Tg | Glass transition temperature (K or °C) |
| ε’ (free space) = 1.0 | Relative permittivity of free space |
| ε’ (air) = 1.0 | Relative permittivity of air |
| ε’ (teflon) ~ 2.2 | Relative permittivity of teflon |
| ε’ (mineral oil) ~ 2.2 | Relative permittivity of mineral oil |
| ε’ (polyimide) ~ 3.6 | Relative permittivity of polyimide |
| ε’ (alumina) ~ 9.8 | Relative permittivity of alumina |
Reference :
Lambient TechnologiesTM Application Note 3.01—Terms and Definitions, All Page
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