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Random Errors

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For this question, I chose B, as random error could be due to human error, however, the answer is C. 

I can understand why it is C, but I don't understand why B is not the right answer. 

Any advice will be appreciated 

Screen Shot 2016-04-24 at 11.09.02 pm.png

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B refers to heat loss to the surroundings, which is a systematic error not a random error. Heat loss can be reduced by using an insulated cup. 

Maybe this video will help:


Edited by Msj Chem

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