1 Copper and PVC water pipes are relatively non-toxic. 2  Copper is a natural material that has been proven to be safe to health. 3  PVC pipes are also safe. 4  Lead on the other hand is extremely toxic. 5  Lead is corrosive and can leak into the drinking water system. PVC is likewise a safe material to carry drinking water. 2  Copper and PVC water pipes do not suffer easily from corrosion, while iron corrodes relatively easily. 3  Copper is relatively easy to work with because it is much softer than iron or lead.
Advanced. Stoichiometry determines the quantitative relationships between reactants and products. Stoichiometric relationships are based on the laws of conservation of mass and energy and the law of combining weights or volumes.
Reliability is important because it ensures we can depend on the assessment results. Standardization is important because it enhances reliability. And practicality is considered last, when the other qualities have been accounted for. To unlock this lesson you must be a Study.com Member.eliability. Reliability is defined as the extent to which an assessment yields consistent information about the knowledge, skills, or abilities being assessed. An assessment is considered reliable if the same results are yielded each time the test is administered.