【Daily Topic】【Storage & Transportation Version 20170503】

2017-05-03 View Original

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Participation reward: 2 Wealth. Correct reward: 6 wealth. Multiple-choice question: Smoke-like solid particles suspended in the air, with a diameter of less than 0.1µm; these are often vapors generated when certain metals melt, which then oxidize and condense in the air to form toxic substances. What are these substances called? A. Dust B. Soot C. Fog D. Vapor. Answer: B

Reply #2 2017-05-03

B. Soot: Fuzzy solid particles include only dust and soot； Soot is suspended solid particles formed during thermal processes. Dust is a solid suspension with a particle size of less than 75 μm, consisting of directly formed particles.

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【Daily Topic】【Storage & Transportation Version 20170503】

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