| 1. | Since the electric current is a physical quantity, it must be real-valued.
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| 2. | This introduces tensors into relativity, by which all physical quantities are represented.
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| 3. | Physical quantities, such as the electric field strength, then become quantum operators.
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| 4. | :None of the above physical quantities are or ever were truly infinite.
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| 5. | The dimension of a physical quantity does not include magnitude or units.
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| 6. | Sensors often tend to be sensitive to more than one physical quantity.
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| 7. | The metric system features a single base unit for many physical quantities.
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| 8. | No reference has been made to any physical quantity or principle.
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| 9. | A "'measuring instrument "'is a device for measuring a physical quantity.
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| 10. | In classical mechanics as in physics, a gravitational field is a physical quantity.
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