2017-7-9 Purification Technology Edition Daily Question

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This post was last edited by hai8487 on 2017-7-10 at 17:12. 1. The vacuum level is ( ). (A) The amount by which the absolute pressure of the fluid under test is lower than atmospheric pressure. (B) The difference between the pressure indicated by the gauge and atmospheric pressure. (C) The amount by which atmospheric pressure is lower than the absolute pressure of the fluid under test. (D) The amount by which the absolute pressure of the fluid under test is higher than atmospheric pressure. 2. Which of the following is an incorrect description of evaporation? ( ) (A) Boiling evaporation occurs not only at the surface of the solution but also within it. (B) Evaporation is a unit operation used for concentrating solutions. (C) Evaporation is a physicochemical process. (D) The main evaporation equipment used in industry is the evaporator. AC Note: Answers to this question must be submitted within two days! ! ! 2017: Coal Chemical Industry – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html Petrochemical Sector – “Creative Ideas for Energy Saving”: The Second Event is in Full Swing http://bbs.hcbbs.com/thread-1666758-1-1.html