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What is the distinction between an object and a substance?

  • A.Objects can be represented and substances cannot be
  • B.Objects have identity and parts, substances divide without limit
  • C.Objects are physical while substances are purely abstract concepts
  • D.Objects are countable and substances are always continuous

Answer: B

Half a chair is not a chair, but half a quantity of butter is still butter, so the two require different treatment in an ontology. Substances are handled as stuff with properties that are intrinsic rather than extrinsic. Both are physical and both are representable, and countability is a linguistic reflection of the distinction rather than its basis. A distinction that language marks and that matters for inference is exactly the kind an ontology must capture explicitly.

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