A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process

COMPOSITION OF WATER. 25 the volume would not be increased. In fact, however much salt be added (until the solution becomes saturated, and will dissolve no more), its volume will remain the same, although its density, salinity, and weight will be increased according to the quantity of salt that is added. If the quantity of salt added be in the proportion of ..V? or A» or , the “density” and weight will be 13V, 1-./V, as the case may be, but the volume of 1 cubic foot will still remain the same. ° Density ” and “ Salinity.n 16. The foregoing observations on the strength of sea water and brines lead one to enquire as to whether “ density ” is the most appropriate term to use for con- veying the meaning of the degree of brine strength. 17. When sea water or brine on being tested is said to have a “ density ” of as the case may be, the meaning is that in a given quantity (i.e., weight) of the salt water there is the above proportion (>£,, or ;fl-, as the case may be) of saline matter dissolved in it. This would be its degree of “ salinity/' and consequently this proportion would be the same whatever the temperature of the specimen tested may be. A “ density ” of or or ./V does not, therefore, correctly denote the state of things, for if 1 cubic foot of salt water contains 2 lbs. (practically y\) of saline matter massed in it, then the salt water would be correctly described as having a “ density ” of 13V ; or if 4 lbs. of salt are massed in it, then a density of 1/., and so on ; or, instead of 32nds, a “ density ” of 1'04, 1 062, T094, as the case may be. Again, a salinometer does not re- cord “ density.'" It records its buoyancy in water at a