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AQA Science: Glossary - True Value
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This is the accurate value which would be found if the quantity could be measured without any errors at all.
e.g. If a 1 metre ruler is entirely accurate in length then it will not be even a tiny amount more or less than 1 metre. The problem is that we cannot measure with 100% accuracy! Even if we knew how many atoms there were along the length of the ruler, we can never expect to know their separation and size exactly either.
In other words, the 'true value' is hypothetical – there is no such thing.
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