Why is the mass of the crucible not determined while it is hot? 5 STARS?
回答 (1)
2017-10-23 2:54 pm
✔ 最佳答案
When a hot crucible is weighed, the hot crucible would heat up the surrounding air. The hot air rises and thus a conviction current of air is produced. The pan of the balance becomes unstable due to the conviction current and this may lead to an incorrect reading.
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https://hk.answers.yahoo.com/question/index?qid=20171023063118AAFoeKp