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Why can’t silver be used to make pots.

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Jin Yi: When are the digits considered significant? (Especially for zero)

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Jin Yi: What is precision?

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Jin Yi: How do you obtain the precision of something? (Eg ruler, measuring cylinder, vernier callipers, etc)

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I encountered this question in the workbook and I wrote ruler as one of the measuring instruments as it can be used to measure regular shaped object’s volume. However the answer sheet provided gave me another answer. Can ruler be accepted as a possible answer?

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can i write that the pan will be out of shape instead of that it will melt?

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Can I just write that the metal balls are denser than the plastic ones and explain that one is denser than water while the other isn't later?

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In the notes, it is stated that the precision of a measuring equipment is equivalent to the smallest unit of measurement of the measuring equipment.(eg. the precision of a ruler is 0.1cm.) However, there was an exercise where you told us that the precision is half the smallest unit of measurement.

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Must we write the formula for density in front of every question that involves comparing densities?