JET PROPULSION LABORATORY
Many years ago I was given a copy of this document, prepared in handwriting, some time in
the early 1960’s. I did not know the author, E.J. Roschke. I have found it to be such a useful
reference that I decided to have an electronic version prepared. Recently, I spoke with Dr.
Roschke, now retired from the Jet Propulsion Laboratory to learn of the document’s origin. In
the early 1960’s a group of research engineers, largely having backgrounds in mechanical
engineering, were engaged in the new field of electric propulsion. They experienced practical
annoyances with the mingling of units from mechanical engineering, electrical engineering and
physics. That situation motivated Dr. Roschke to assemble this material.
Although I have carefully checked the values given here, it is quite possible that some
typographical errors remain. I will appreciate learning any corrections that should be made.
California Institute of Technology
UNITS AND CONVERSION FACTORS
Table of Contents
Decimal Multiples and Submultiples
Description of Units
Mechanical, Electric, Magnetic
Equivalent Units mksq System
Dimensions of esu and emu Electric
and Magnetic Quantities
Dimensions and Units for Physical Quantities — mksq System
C. Electric and Magnetic
Conversion of mksq Units to Gaussian Units
A. Plane Angle
B. Solid Angle
L. Energy, Work, Heat
M. Specific Energy
N. Specific Energy Per Unit Temp.
P. Heat Flux
Q. Heat Transfer Coefficient
R. Thermal Conductivity
S. Absolute Viscosity
T. Kinematic Viscosity
AA. Electric Charge
BB. Electric Current
CC. Electric Potential
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