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Checking For The Correct Units - HP -28S Manual

Advanced scientific calculator.
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Next convert 10 cubic feet to gallons.
Clear the stack and enter the numerical value .
1
CLEAR
1
10
1
ENTER
1
Enter the unit string for Hcubic feeV
~----------------------~
Ioil
ITQ]
ft
.rAl
3
1
ENTER
I
8:
LJ
LJ
2:
10
1:
"ft
A
8"
IiiDlDIIlRDlmaDBDlID
Key in the unit for HUS gallon" and convert.
~----------------------~
ITQ]
gal
.1
CONVERT
I
8:
2:
74.8051948052
1:
'9al'
IiiDlDIIlRDlmaDBDlID
The result shows that 10 cubic feet converts to 74.8051948052
gallons.
Checking for the Correct Units
Using incorrect units can lead to unexpected numerical results or to an
I
ncons i s t en t
Un its
error. The solution in either case is to check
the UNITS catalog or the HUNITS
H
section of the Reference Manual.
Unexpected numerical results can occur if you use a unit with the cor-
rect dimensions but an incorrect numerical value. For example, if you
convert one acre to
Hft"Y ,
the result is greater than 43,560. This oc-
curs because there are two
Hfoot
H
units,
Hft"
(international foot) and
HftUS" (survey foot). Converting one acre to HftUS"2" returns exactly
43,560.
An I
ncons i s t en t
Un its
error occurs if you use a unit with in-
correct dimensions. For example, this occurs if you use Hlb" (pound) as
a unit of force. The correct unit for force is nlbf" (pound-force).
146
14: Unit Conversion
I

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