even when the paint being disturbed has a lead concentration less than the EPA limit of 0.5%. Illustration 1 is a graph of typical airborne lead levels for common work activities when the paint film that is being damaged contains approximately 0.3% leadâa concentration low enough that the material is exempted from RRP requirements.
Reactance is mathematically symbolized by the letter âXâ and is measured in the unit of ohms (Ï). Impedance is a comprehensive expression of any and all forms of opposition to electron flow, including both resistance and reactance. It is present in all circuits, and in all components.
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).