PChemLabTXT_page_601

PChemLabTXT | page 601 | https://thedailydialectics.com/pdfs/education/chemistry/p-chem/PChemLabTXT/PChemLabTXT.pdf

590 Chapter XVIII Vacuu FIGURE 2 Roots blower. gar28420_ch18_587-600 Sec1:590 Confirming Pages ic m Techniques resultant contamination of the oil. It is inadvisable to permit organic vapors to enter even a vented exhaust pump, because of their high solubility in the oil; it is much better to freeze…