如何計算誤差百分比？

Question

1. Calculate the percentage error arising in an experiment when 1ml, 5ml, and 10ml pipets are for transfer and each pipet contains 5 drops of water adhering to the inside of the barrel. A single drop of water has an approximate volume of 0.05ml.

2. If a 0.5ml air bubble is present in the tip of a buret, what percent error in 10ml, 20ml, and 40ml samples will result if air bubble is dislodged during the dispensing of the samples?

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Answer 1

1. 5 滴水的體積＝ 5 * 0.05 = 0.25 ml ，則百分誤差分別為：　在 1ml 的量管百分誤差＝ 0.25/1 = 25%　在 5ml 的量管百分誤差＝ 0.25/5 = 5%　在 10ml 的量管百分誤差＝ 0.25/10 = 2.5%2. 0.5ml 的氣泡存在於量管的頂端所產生的百分誤差分別為：　在 10ml 的樣品所產生百分誤差＝ 0.5/10 = 5%　在 20ml 的樣品所產生百分誤差＝ 0.5/20 = 2.5%　在 40ml 的樣品所產生百分誤差＝ 0.5/40 = 1.25%