Company Writer's Guide
[For Illustration Only] B-9
Symbols for Units in General Use (Cont’d)
Unit Symbol Notes
gigaelectronvolt GeV
gigahertz GHz
gilbert Gb
The gilbert is the electromagnetic CGS unit of
magnetomotive force. Deprecated
(see ANSI Z210.1-1976).
grain gr
gram g
gram per cubic centimeter g/cm
3
gray Gy
SI unit of absorbed dose in the field of radiation
dosimetry.
hecto h SI prefix for 10
2
.
henry H SI unit of inductance.
hertz Hz SI unit of frequency.
horsepower hp
The horsepower is an anachronism in science
and technology. Use of the SI unit of power, the
watt, is preferred.
hour h
inch in.
conventional inch of
mercury
inHg 1 inHg = 3386.4 Pa (ISO)
conventional inch of
water
inH
2
O 1 inH
2
O = 249.09 Pa (ISO)
inch per second in/s
joule J SI unit of energy, work, quantity of heat.
joule per kelvin J/K SI unit of heat capacity and entropy.
kelvin K
In 1967, the CGPM gave the name kelvin to the SI
unit of temperature which had formerly been
