UNITS IN COMMON USE IN LABORATORIES. 



Cubic Meter. Unit of space for the number of organisms in air. 

 It contains 1000 litres. It is equal to 1-308 cubic yards or 

 35.316 cubic feet. One thousand cubic feet, the unit of space 

 in disinfection, is equal to 28.3 + cubic meters. 



Litre. Unit of space for normal volumetric solutions. It contains 

 1000 cubic centimeters. It is equal to 1.0567 quarts or 33.8 + 

 ounces. A liter of distilled water weighs i kilogram. 



Cubic Centimeter. Unit of space for organisms in water, milk, 

 vaccines, etc., ic.c.=o.27 fl. dr. There are, approximately, 

 16 drops in i c.c. 



Cubic Millimeter. Unit of space for blood-cells. There are 1000 

 cubic millimeters in i cubic centimeter and i million cubic milli- 

 meters in i litre. In water analysis, as there are i million milli- 

 grams in one litre, parts in the million and milligrammes per 

 litre are the same. 



i Meter = 3 9.3 7 inches. 



i Centimeter = .3937 inch. Approximately, 2/5 inch. 



i Millimeter = .0393 inch. Approximately, 1/25 inches. 



i Kilogram = 2.2+ pounds av. 



i Gram = 15. 432 grains. 



i Milligram = 0.0154 grain. Approximately, 1/64 grain. 



A pound avoirdupois is equal to 453.59 gm. 



One hundred cubic centimeters of a saturated solution contains: 



