FORCE AND ENERGY. 233 
Since, however, most of the results of investigations upon the 
physiological relations of energy are expressed in calories (often 
without any statement of temperature) it will be more convenient 
in the following pages to employ this unit rather than the more 
rational Kilojoule. 
Finally, since measurements of mechanical energy (as in experi- 
ments with working animals) have been commonly made in weight 
units, it is necessary to know the relation of these to the calorie. 
These relations are included in the following table, the force of 
gravity being taken as 980.5 dynes: 
EQUIVALENCE OF UNITS OF ENERGY. 
Ergs.* Kilojoules. | Gram- | Kilogram- 
meters. meters. 
1 Kilojoule =.......... 50 eee eee ere rarer 101989 
1 gram-meter = ....... 980.510? | 980.5+108 | ...... 0.001 
1 kilogram-meter =.... 980.510° | 980.5+10° 1000 
1 foot-pound =........ 135.5105 | 135.5+10° 138.2 0.1382 
Talla esis ew se au ata soca ade 4.18310" 0.004183 | 426.6 0.4266 
TL Caliah ons eh lard hale a8 4.18310" 4.183 426600 | 426.6 
oo cal. Calig. 
1 Kilojoule = ................. 738.1 239.1 0.2391 
1 gram-meter = .............. 0.007236 0.002344 | 0.2344+ 10° 
1 kilogram-meter = ........... 7.236 2.344 0.002344 
Tfo0t- pound och 2 ke os esd ell eens enna 0.3239 0.000324 
Ve Calli giscs is ahs denn Wowace emis oes S087 “fein geeeaes 0.001 
V Galigye ta sea ke eis  Sbso ea 3087. 1000 
* From Ostwald, Grundriss der allgemeinen Chemie. 
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