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Bob wants to better understand the evacuation of a system. “Think back about how an evacuation works, Bob, and we will discuss some terms,” said Btu Buddy. “The vacuum pump removes vapor from a system. Some technicians think it will remove solids and acids, but no, it only removes vapor. If that acid is in the form of smoke from a motor burn, it will remove that. A vacuum pump is a ‘vapor pump,’ just like a compressor, except it is capable of pumping in very low pressure ranges.”