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Direct Energy, 2018a

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Appendices 341<br />

Appendices<br />

Appendix A: Variable List<br />

Vectors are denoted −→ v , and unit vectors are denoted ˆv. In the third column,<br />

an asterisk * indicates that the units vary depending on the context. In<br />

the fourth column, S =scalar, V =vector, C =constant, F =functional,<br />

and O =operator. Constants are specied to four signicant gures.<br />

Symbol Quantity SI Units Scalar? Comments<br />

â x , â y ,<br />

â z<br />

Cartesian<br />

coordinate unit<br />

vectors<br />

unitless<br />

V<br />

â r , â θ ,<br />

â φ<br />

Spherical<br />

coordinate unit<br />

vectors<br />

unitless<br />

V<br />

−→ a Acceleration m s<br />

2 V<br />

A<br />

Cross sectional<br />

area<br />

m 2<br />

S<br />

A 12<br />

Einstein A<br />

coecient<br />

s −1<br />

A aff Electron anity J<br />

atom<br />

−→ b Pyroelectric<br />

C<br />

m<br />

coecient<br />

2·K<br />

S<br />

S<br />

V<br />

B 12 ,B 21<br />

Einstein B<br />

coecient<br />

m 3<br />

J·s 2<br />

S<br />

−→ B<br />

Magnetic ux<br />

density<br />

Wb<br />

m 2<br />

V<br />

B Bulk modulus N m<br />

2 S<br />

c<br />

Speed of light in<br />

free space<br />

m s C =2.998 · 10 8

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