Calculating with temperature units, 25_“c/nin, 5_tfmin – HP 48g Graphing Calculator User Manual
Page 129: L_°ffnin, 45_°ffpiin
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Example:
Convert 25_,,.
“
Cv'min to
°
in.
Step 1:
First, create the unit object 25..C’C■ ■ ■ rMin.
fr^ (
units
1 (NXTl T E M F'
1:
25_“C/nin
25 “F
iiiiiiiBigiiiiiHMtaiiBTHii
fr^(UNITS)
T I M E M I N
Step
2: Enter a unit object containin
g the new units.
(r^fMENU) 1 “ F
£5_TFmin
0(MENU)(|iJ MIH
1:
l_°FFnin
roaiBgraB
Step 3:
Perform the conversion.
I^f
units
') COH
v
1:
45_°FFpiin
10
Calculating with Temperature Units
Temperature units are automatically converted and combined during
calculations.
■ Pure temperature imits (levels or differences).
The relational
operators (<, >, <, >, ==, yt) interpret pure temperatures as
temperature
levels relative to absolute zero
for all temperature
scales. Before making the calculation, the HP 48 converts any
Celsius or Fahrenheit temperature to absolute temperatures.
The operators + and — and the functions %CH and %T require
that pure temperature arguments either both be absolute
temperatures (K or °R), both °C, or both °F. This ensures that
such operations retain their correct algebraic properties.
For all other functions, pure temperature units are interpreted
as temperature
differences
—they’re not converted before the
calculation.
■ Combined temperature miits (differences).
Temperature units with
prefixes, exponents, or other units are interpreted as temperature
differences
—they’re not converted before the calculation.
Unit Objects 10-11