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Engineering Variables
Letters Used to Represent Engineering Quantities
27
Engineering
10th Grade
02/27/2008

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Term

A

Definition
This variable represents AREA. Its SI unit is m2
Term

a

Definition
This variable represents ACCELERATION. Its SI unit is m/s2
Term

act

Definition
This letter and its subscript represent CENTRIFUGAL ACCELERATION. Its SI unit is m/s2
Term
d
Definition
This variable represents DIAMETER. Its SI unit is meters.
Term
E
Definition
This variable represents ENERGY. Its SI unit is Joules.
Term

Ek

(Say "E sub k")

Definition
This variable represents KINETIC ENERGY. Its SI unit is Joules.
Term

Ep

(Say "E sub p")

Definition
This variable represents POTENTIAL ENERGY. Its SI unit is Joules.
Term
F
Definition
This variable represents FORCE. Its SI unit is Newtons.
Term

Fcf

 

(say "F sub cf")

Definition
This variable represents CENTRIFUGAL FORCE. Its SI unit is Newtons.
Term
G
Definition
This variable represents WEIGHT. Its SI unit is Newtons.
Term
g
Definition
This variable represents acceleration due to gravity. On earth it is equal to 9.8 m/s2
Term
h
Definition
This variable represents HEIGHT. Its SI unit is Meters.
Term
l
Definition
This variable represents LENGTH. Its SI unit is Meters.
Term
m
Definition
This variable represents MASS. Its SI unit is Kilograms.
Term

n

Definition
This variable represents revolutions per second. Its SI unit is s-1, which means "per second"
Term
P
Definition
This variable represents POWER. Its SI unit is Watts.
Term
r
Definition
This variable represents RADIUS. Its SI unit is meters.
Term
V
Definition
This variable represents VOLUME. Its SI unit is m3 or Liters.
Term

α,β

(alpha, beta)

Definition
These variables are commonly used to denote ANGLES. SI units include radians and degrees.
Term
t
Definition
This variable represents TIME. Its SI unit is seconds.
Term
f
Definition
This variable represents FREQUENCY. Its SI unit is Hertz.
Term
ω
Definition
This variable represents ANGULAR VELOCITY. Its SI unit is radians per second.
Term
a
Definition
This variable represents ACCELERATION. Its SI unit is m/s2.
Term
p
Definition
This variable represents pressure. Its SI unit is the Pascal
Term

Pabs

 

(say "p sub abs")

Definition
This variable represents ABSOLUTE PRESSURE. Its SI unit is the Pascal.
Term

P.S.I.G.

Definition
Pounds Per Square Inch Gauge. This is a measure of pressure relative to atmospheric pressure. At atmospheric pressure, this gauge will read zero.
Term
P.S.I.A.
Definition
Pounds Per Square Inch Absolute. This pressure is referenced to perfect vacuum. At atmospheric pressure, this guage would read 14.7 p.s.i.g.
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