Welcome To Whitehall Township Whitehall Township is located in the center of the Lehigh Valley. The Township is one hour north of Philadelphia and an hour and half from New York City.
SALINITY OVERVIEW Salinity is the concentration of dissolved salts in water, usually expressed in parts per thousand (ppt). Objects float higher in salt water than fresh water because salt water is denser (heavier per unit of volume).
The expression 1 ppm means a given solute exists at a concentration of one part per million parts of the solution. These are two common ways to think about what the concentration 1 ppm means: a) it is one-millionth of a gram per gram of sample solution. b) it is one gram of solute per million grams of sample solution. Notice that the more general word 'part' is used above, but 'gram' is used in (a) and (b) just above.