Answers

2016-01-27T20:49:53+08:00
Maybe to prevent any water absorption by the reagents or evaporation of the reagents so you don't go wafting weird smelling chemicals about the lab when traveling to and from the weighing scales.
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2016-01-27T20:50:16+08:00
To prevent any water absorption by the reagents or evaporation of the reagents
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