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1-suppose that the three fundamental standards of the metric system were length,density and time rather than length,mass and time . the standard of density in this system is to be defined as that of water . what consideration about water would you need to address to make sure that the standard of density is as accurate as possible

2- A sidewalk is to be constructed around a swimming pool that measures (10.0+/-0.1) m by (17.0 +/-0.1)m . if the sidewalk is to measure (1.00+/-0.01)m wide by (9.0+/-0.1)cm thick ,what volume of concrete is needed , and what is the approximate uncertainty of this volume?

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