Determination of fluid category 2. Water in fluid category 1 whose aesthetic quality is impaired owing to: 1  a change in its temperature; or. 2  the presence of substances or organisms causing a change in its taste, odour or appearance, including water in a hot water distribution system.
Credibility is defined as the quality or power of inspiring belief. Credible sources, therefore, must be reliable sources that provide information that one can believe to be true. It is important to use credible sources in an academic research paper because your audience will expect you to have backed up your assertions with credible evidence.
There are two types of evidence. First hand research is research you have conducted yourself such as interviews, experiments, surveys, or personal experience and anecdotes. Second hand research is research you are getting from various texts that has been supplied and compiled by others such as books, periodicals, and Web sites. Regardless of what type of sources you use, they must be credible. In other words, your sources must be reliable, accurate, and trustworthy.