In the last three decades there has been an increasing emphasis on the importance of the use of fidelity assessment on improving the science of psychological, social, and behavioral research.
A cleanroom is an area or enclosure in which the air has to be cleaned to a defined particle limit, usually in particles per cubic foot. In the United States most cleanrooms are discussed in terms of Classification Limits.
A flush toilet or water closet (WC) is a toilet that disposes of the waste products by using water to sweep them away down a drainpipe. The water is also used as a hygienic barrier between the drainpipe and the user.