Assertion: concrete's density | /r/HasProperty | just 7.5% of water
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Source sentences:
text: The development of synthetic-enzyme based foaming agents, foam stability enhancing admixtures and specialised foam generating, mixing and pumping equipment has improved the stability of the foam and hence foam concrete, making it possible to manufacture as light as 75 kg/m³ density, a density that is just 7.5% of water.