Assertion: hydrogen's density | /r/CapableOf | vary with temperature
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text: The density varies with temperature, but not linearly: as the temperature increases, the density rises to a peak at 3.98 °C (39.16 °F) and then decreases; this is unusual.[d] Regular, hexagonal ice is also less dense than liquid water—upon freezing, the density of water decreases by about 9%.[e]