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Direct Energy, 2018a

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348 Appendices<br />

Symbol Quantity Units Scalar? Comments<br />

ρ Resistivity Ωm S<br />

ρ ch Charge density C m<br />

3 S<br />

ρ dens<br />

σ<br />

Mass density<br />

Electrical<br />

conductivity<br />

kg<br />

m 3<br />

1<br />

Ω·m<br />

−→ ς Stress Pa V<br />

S<br />

S<br />

τ<br />

Thomson<br />

coecient<br />

V<br />

K<br />

S<br />

−→ τ Torque N·m V<br />

φ Angle (Azimuth) rad S<br />

Υ Invariant * S<br />

χ e<br />

Electric<br />

susceptibility<br />

unitless<br />

χ Electronegativity J<br />

atom<br />

S<br />

ψ Wave function unitless S<br />

Ψ Magnetic ux Wb S<br />

ω Frequency rad s S<br />

−−→<br />

ω ang Angular velocity rad s V<br />

Planck constant J·s C =1.055 · 10 −34<br />

divided by 2π, also<br />

called hbar<br />

−→ ∇ Gradient operator O Also called del<br />

S<br />

∂ t<br />

Shorthand for<br />

partial derivative<br />

∂<br />

∂t<br />

O

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