| 21. | Scalars and Vectors are physical quantities and not objects.
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| 22. | For most quantities a unit is absolutely necessary to communicate values of that physical quantity.
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| 23. | Analogue devices, however, which express data using continuously variable physical quantities, were in wide use.
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| 24. | Without defining the physical quantities or their exact relationships, it is not physical or mathematical.
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| 25. | The sound field can be described using physical quantities like sound pressure and particle velocity.
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| 26. | Von Neumann and Morgenstern stated that the question of measurability of physical quantities was dynamic.
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| 27. | A digital signal is a physical quantity that alternates between a discrete set of waveforms.
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| 28. | For example, I have been working on physical quantity, physical constants and dimensionless quantities lately.
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| 29. | By 1871, he presented the " Remarks on the mathematical classification of physical quantities ".
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| 30. | For example, although torque and energy share the dimension, they are fundamentally different physical quantities.
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