HP 25 Owner's Handbook Manual page 130

Useful Conversion Factors
The following factors are provided to 10 digits of accuracy
where possible. Exact values are marked with an asterisk. For
more complete information on conversion factors , refer to
Metric Practice Guide E380-74 by the American
Society for
Testing and Materials (ASTM) .
Length
1 inch
1 foot
1 mile (statute) t
1 mile (nautical)t
1 mile (statute) t
Area
1 square inch
1 square foot
1 acre
1 square milet
Volume
1 cubic inch
1 cubic foot
1 ounce (fluid) t
1 ounce (fluid)t
1 gallon (fluid) t
Mass
= 25.4 millimeters'
= 0.3048 meter'
= 1.609344 kilometers'
= 1.852 kilometers'
= 1.150779448 miles (nauticallt
= 6.451 6 square centimeters'
= ·0.09290304 square meter'
= 43560 square feet
= 640 acres
= 16.387064 cubic centi meters'
= 0.028316847 cubic meter
= 29.57352956 cubic centimeters
= 0.029573530 liter
= 3.785411 784 liters'
1 ounce (mass) = 28.34952312 grams
1 pound (mass) = 0.45359237 kilogram '
1 ton (short) = 0.90718474 metric ton'
Energy
1 British thermal unit
1 kilocalorie (mean)
= 1 055.055853 joules
= 4190.02 joules
1 watt-hour
= 3600 joules'
Force
1 ounce (force) = 0.27801385 newton
1 pound (force) = 4.448221 615 newtons
Power
1 horsepower (electric) = 746 watts'
Pressure
1 atmosphere
1 atmosphere
1 atmosphere
Temperature
Fahrenheit
Celsius
kelvin
kelvin
kelvin
= 760 mm Hg at sea level
= 14.7 pounds per square inch
= 101 325 pascals
= 1.8 Celsius
+
32
= 5/9(Fahrenheit - 32)
= Celsius
+
273.15
= 5/9 (Fahrenheit
+
459 .67)
= 5/9 Rankine
t U.S. values chosen. 'Exact values.