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The density of water (and other fluids) depends both on the pressure and the temperature. A graph for water is here: You may see that at 1 bar (1 atmosphere), the density is highest around 4 °C. That's the conditions where the density reaches the nice 1,000 kilograms per cubic meter. Water contracts when it gets warmer than that, but also when it gets ...


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Please study Ned Wright's Cosmology FAQ: How do Astronomer's Measure the Density of the Universe? There it is pointed out that the local density varies from region to region; the scale of the region surveyed determines the granularity. The answer is clear and obvious: the density of the universe is NOT uniform at all distance and time scales.



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