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- Q181175 subject Q7163675.
- Q181175 abstract "In physics, a scalar is a one-dimensional physical quantity, i.e. one that can be described by a single real number (sometimes signed, often with units), in other words a scalar is a physical quantity that only has magnitude but no direction, unlike (or as a special case of) vectors, tensors, etc. which are described by several numbers which characterize magnitude and direction and a vector can be defined as a physical quantity that has magnitude and direction. Formally, a scalar is unchanged by coordinate system rotations or reflections (in Newtonian mechanics), or by Lorentz transformations or space-time translations (in relativity). A related concept is a pseudoscalar, which is invariant under proper rotations but (like a pseudovector) flips sign under improper rotations. The concept of a scalar in physics is essentially the same as in mathematics. A physical scalar field is one type of more general fields, like vector fields, spinor fields, and tensor fields. An example of a scalar quantity is temperature: the temperature at a given point is a single number. Velocity, on the other hand, is a vector quantity: velocity in three-dimensional space is specified by three values; in a Cartesian coordinate system the values are the speeds relative to each coordinate axis. The associated fields describe the temperature and velocity in each point of some space. Considering the norms of the velocity vectors results in a scalar field of the speeds in each point of the space.".
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- Q181175 type Thing.
- Q181175 comment "In physics, a scalar is a one-dimensional physical quantity, i.e. one that can be described by a single real number (sometimes signed, often with units), in other words a scalar is a physical quantity that only has magnitude but no direction, unlike (or as a special case of) vectors, tensors, etc. which are described by several numbers which characterize magnitude and direction and a vector can be defined as a physical quantity that has magnitude and direction.".
- Q181175 label "Scalar (physics)".
- Q181175 seeAlso Q18338.