Quotation by Percy W. Bridgman

To find the length of an object, we have to perform certain
physical operations. The concept of length is therefore fixed when the operations by which length is measured are fixed: that is, the concept of length involves as much as and nothing more than the set of operations by which length is determined.
Percy W. Bridgman (1882–1961), U.S. physicist, father of operationalism. The Logic of Modern Physics (1927).

Classical illustration of operationalism.
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