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58问答库 > 为了使称量误差（万分之一天平）小于0.1%，取样时应大于多少？ 20mg 200mg 2g？为什么？

为了使称量误差（万分之一天平）小于0.1%，取样时应大于多少？ 20mg 200mg 2g？为什么？

2025-03-29 13:56:09

推荐回答（2个）

回答（1）：

万分之一天平的准确性是0.0001g=0.1mg
0.1mg/0.1%=100mg （0.1%是误差要求）
必须称量大于100mg才能保证误差小于0.1%

显然20mg不够，200mg，2g都可以达到要求

回答（2）：

取样时应大于1g，万分之一天平的最后一位是估读的，是不保证精度的。所以取样大于1g就可以了。

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