A simple definition of what would be "the opposite of my room." But technically speaking, a clean room is a highly purified and regulated room for the production of sensitive equipment contamination. For example, the production of microprocessors is in a clean room, since smaller amounts of dust can create defects in production. therefore, the air in a clean room is continuously filtered. other aspects, such as temperature, humidity and pressure may be regulated as well.
Clean rooms are categorized according to a federal standard. A 1000 clean room class has no more than 1000 greater than 0.5 micron particles in a cubic foot of air. A 100 cleanroom class has no more than 100 particles. People who work in clean rooms must wear special suits that prevent them from contaminating the room. They almost look like space suits, but are not quite as heavy and does not require large boots to walk on the moon