1 For the first time in 20 years, federal health authorities have lowered the recommended limit for lead exposure in young children, which they say could add 200,000 children to those believed to have unsafe lead levels in their blood.
The volume can be measured in cubic meters, cubic centimeters, or liters. The units of the three-dimensional volume depend on the units of length-if the lengths are in meters, the volume will be in cubic meters, etc. To measure a square or cube: Volume = length times width times height.
Units of Measure. A unit of measure is the amount of chemical found in a specific volume of waterâfor example, pounds/gallon or teaspoons/gallon. It is also called concentration units, or simply units. The four common units of measure used in drinking water analysis results are mg/L, Âµg/L, ppm, and ppb. Milligrams per liter (mg/L) is equivalent to ppm (parts per million). To convert mg/L to Âµg/L simply multiply by 1000 (1 mg/L = 1000 Âµg/L).