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.
A pH meter is an instrument used to measure acidity or alkalinity of a solution-also know as pH. pH is the unit of measure that describes the degree of acidity or alkalinity. It is measured on a scale of 0 to 14.he pH electrode can be thought of as a battery, with a voltage that varies with the pH of the measured solution. The pH measuring electrode is a hydrogen ion sensitive glass bulb, with a millivolt output that varies with the changes in the relative hydrogen ion concentration inside and outside of the bulb.