Keeping a Cfean House

Clean air confi'nuousCy flows from every pore of the ceiling and through the holes in the floor into a filtering system at the manufacturing plant. A normal room contains some 15 million dust particles per cubic foot, but a clean room contains less than 1 dust particle per cubic foot. All of the air in a "clean room" is replaced seven times every minute.
Portions of the micro chip manufacturing process are performed in yellow light because the wafers are coated with a light-sensitive material called "photoresist" before the next chip pattern is imprinted onto the surface of the silicon wafer.