Molecular formula :
nature : pumping gas (or vapor) for the vacuum device. According to the gas can be divided into dry and wet-dry vacuum pump (dry vacuum pump) and the wet vacuum pump (wet vacuum pump). Only dry vacuum suction from the containers of gas, they can achieve 96% to 99.9% vacuum. Wet vacuum suction in the system of gas at the same time, with more water vapor, it can only have a 80% to 85% vacuum. Under the structure can be divided into reciprocating vacuum pumps, rotary vane vacuum pump and water ring vacuum pump. For vacuum evaporation and vacuum distillation, vacuum filter operating.
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