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macroscopic:quantity,
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fluid:quantity,
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thermodynamic:quantity,
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average:property,
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mechanical:quantity,
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fluid:state,
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fluid:property,
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elastic:property,
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periodic:property,
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celestial:body,
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macroscopic:property,
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structural:property,
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experimental:property,
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physical:quantity,
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conserved:quantity,
Category Nuances for mass_density:
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elastic,
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fluid,
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celestial,
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experimental,
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macroscopic,
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average,
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structural,
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physical,
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conserved,
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thermodynamic,
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periodic,
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mechanical,
Simple Categories for mass_density: