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preface to fifteenth edition

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2.44 SECTION 2<br />

TABLE 2.7<br />

Conversion Fac<strong>to</strong>rs (Continued)<br />

To convert In<strong>to</strong> Multiply by<br />

Hertz cycle per second* 1<br />

Hogshead gallon (U.S.)* 63<br />

Horsepower (British) Btu per hour 2544.43<br />

foot pound per hour* 1.98 10 6<br />

horsepower (metric) 1.013 87<br />

joule per second 745.700<br />

kilocalorie per hour 641.186<br />

kilogram-meter per second 76.0402<br />

watt 745.70<br />

Horsepower (electric) watt* 746<br />

Horsepower-hour (British) Btu 2544.43<br />

foot-pound* 1.98 10 6<br />

joule 2.684 52 10 6<br />

kilocalorie 641.186<br />

kilogram-meter 2.737 45 10 5<br />

watt-hour 745.7<br />

Hour (mean solar) day (1/24)<br />

minute* 60<br />

second* 3600<br />

week (1/168)<br />

Hundredweight (long) kilogram* 50.802 345 44<br />

pound* 112<br />

<strong>to</strong>n (long) (1/20)<br />

<strong>to</strong>n (metric) 0.050 802 345<br />

<strong>to</strong>n (short)* 0.056<br />

Hundredweight (short) hundredweight (long) 0.892 857<br />

Inch centimeter* 2.54<br />

foot (1/12)<br />

mil* 1000<br />

Inch of mercury (0C) atmosphere 0.033 421 05<br />

inch of water (4C) 13.5951<br />

millibar 33.863 88<br />

millimeter of water (4C) 345.316<br />

pascal3386.388<br />

pound per square inch, psi 0.491 1541<br />

Inch of water (4C) inch of mercury (0C) 0.073 5559<br />

millibar 2.490 89<br />

millimeter of mercury (0C) 1.868 32<br />

pascal249.089<br />

pound per square inch, psi 0.036 1273<br />

Inch per minute foot per hour* 5<br />

meter per hour* 1.524<br />

millimeter per second 0.423 333<br />

Joule Btu 9.478 170 10 4<br />

calorie* 0.2390<br />

centigrade heat unit, chu 5.265 65<br />

centimeter-dyne* 10 7<br />

cubic foot-atmosphere 0.000 348 529<br />

cubic foot-(pound per in 2 ) 0.005 121 959<br />

erg* 10 7<br />

foot-pound 0.737 562<br />

foot-poundal23.7304<br />

horsepower-hour (British)<br />

3.725 06 10 7<br />

liter-atmosphere 0.009 869 233

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