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Ancheta Wis (talk | contribs) →Characterization: The difference between mass and weight becomes obvious for space travelers. |
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The scientific method depends upon the careful characterization of the subject of the investigation.
[[Observation]] demands careful ''[[measurement]]'' and the use of ''[[operational definition]]s'' of relevant concepts. When the terms used are formally defining, they acquire exact meanings which do not necessarily correspond with their use in [[natural language]]: for example, ''[[mass]]'' and ''[[weight]]'' are quite distinct concepts. But the distinction is moot in in many applications in our everyday life. For those who live only on the surface of the [[earth]] and are not in orbit around it, there may
New theories may arise when it is realised that words used have not previously been clearly defined. For example, [[Albert Einstein|Albert Einstein's]] first paper on [[relativity]] begins by defining [[simultaneity]] and the means for determining [[length]] (which were skipped over by [[Isaac Newton]] with "I do not define [[time]], space, place and [[motion]], as being well known to all") and proceeds to demonstrate that, given these definitions, certain widely accepted ideas (absolute time; length independent of motion) were invalid.
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