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An intrinsic property is a property that an object or a thing has of itself, independently of other things, including its context. An extrinsic (or relational) property is a property that depends on a thing's relationship with other things. For example, density is an intrinsic property of any physical object, whereas weight is an extrinsic property that varies depending on the strength of the gravitational field in which the respective object is placed. As such, the question of intrinsicality and extrinsicality in empirically observable objects is a significant field of study in ontology, the branch of philosophy concerned with explaining the fundamental nature of being. ==Criteria== David Lewis offered a list of criteria that should condense the distinction between intrinsic and extrinsic properties (numbers and italics added): # A sentence or statement or proposition that ascribes intrinsic properties to something is entirely ''about that thing''; whereas an ascription of extrinsic properties to something is not entirely about that thing, though it may well be about some larger whole which includes that thing as part. # A thing has its intrinsic properties in virtue of ''the way that thing itself, and nothing else, is''. Not so for extrinsic properties, though a thing may well have these in virtue of the way some larger whole is. # The intrinsic properties of something ''depend only on that thing''; whereas the extrinsic properties of something may depend, wholly or partly, on something else. # If something has an intrinsic property, then so does ''any perfect duplicate'' of that thing; whereas duplicates situated in different surroundings will differ in their extrinsic properties. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Intrinsic and extrinsic properties (philosophy)」の詳細全文を読む スポンサード リンク
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