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).
understand. EPA uses ppm in most of their literature for the National Primary Drinking Water Standards. Parts per million also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contami-nate per unit volume of water. Seeing ppm or mg/L on a lab report means the same thing. The University of Minnesota provides some other analogies that may help you visualize the scale involved with ppm and ppb. One ppm is like: