18 PUBLIC HEALTH CHEMISTRY 



Length. 



i mm. (millimetre) = ^ s of an inch. 



i cm. (centimetre) = i of an inch. 



i inch = 25 '4 millimetres or 2^ centimetres. 



Mass. 



i mgr. (milligramme) = 0-01543 grain (or approx. - tf a T gr.). 



I grm. (gramme) = 15-4323 grains. 



i kgr. (" kilo " or kilogramme) = 2 Ib. 3^ oz. avoirdupois. 



i pound avoirdupois = 453-592 grammes. 



i ounce avoirdupois = 28*35 grammes. 



i grain = 0-0648 gramme or 64-8 milligrammes. 



Capacity. 



i centimil = 0-17 minims (approx.) imperial measure. 



i decimil =1-7 minims (approx.) imperial measure. 



i c.c. (cubic centimetre) (or i mil) = 16-9 minims, imperial 



; measure. 



i L. (litre) = 35-196 fluid ounces (35 fl. oz., i fl. dr., 

 34 min.), imperial measure. 



i fl. ounce, imperial measure = 28-42 cubic centimetres. 



i pint, imperial measure = 568-34 cubic centimetres. 



i gallon, imperial measure = 4*546 litres, or 10 Ib. avoir- 

 dupois of pure water at 62 F., and under an atmos- 

 pheric pressure of 30 inches of mercury. 



