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Definitions (101)
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Real object
The point(s) from which light rays diverge as they enter a lens or mirror. See: virtual object.
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Virtual object
The point(s) to which light rays converge as they enter a lens. The rays pass through each object point. See: real object.
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Misuse alert
Do not call an authoritative or ‘book’ value of a physical quantity a theoretical value, as in: 'We compared our experimentally determined value of index of refraction with the theoretical value [..]
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Misuse alert
One hears some folks with superficial minds say 'Einstein showed that everything is relative.' In fact, special relativity shows that only certain measurable things are relative, but in a pr [..]
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Misuse alert
Many books emphasize that the mole is 'just a number,' a measure of the number of particles in a collection. They say that one can have a mole of any kind of particles, baseballs, atoms, sta [..]
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Misuse alert
Be careful that the reader does not confuse this with the colloquial usage: 'One factor in the success of this experiment was…'
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Absolute uncertainty
The uncertainty in a measured quantity is due to inherent variations in the measurement process itself. The uncertainty in a result is due to the combined and accumulated effects of these measurement [..]
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Virtual image
The point(s) from which light rays converge as they emerge from a lens or mirror. The rays do not actually pass through each image point, but diverge from it. See: real image.
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weight
The size of the external force required to keep a body at rest in its frame of reference.
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Units
Labels which distinguish one type of measurable quantity from other types. Length, mass and time are distinctly different physical quantities, and therefore have different unit names, meters, kilogram [..]
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