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 =.......... TO Need wae 101989 
1 gram-meter = ....... 980.5 X10? | 980.5+108 | ...... 0.001 
1 kilogram-meter =.... 980.510* | 980.5105 1000 
1 foot-pound =........ 185.5X10® | 135.5+10° 138.2 0.1382 
1 caliecsccssexcasesves 4.183107 0.004183 | 426.6 0.4266 
VW Calliesiecracigae sos eeaiew 4.18310" 4.183 426600 | 426.6 
ae caly,. Calis. 
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 
1 foot-pound = ............ 026) creer eee 0.3239 0.000324 
1 Calis: ees ceayenei es dered ys BOBT |i eieacandensonraners 0.001 
1 Calne. conc ceyss asa sons aes a3 3087 1000 
* From Ostwald, Grundriss der allgemeinen Chemie. 
