what is Scalar quantity
Answers
Explanation:
A scalar or scalar quantity in physics is a physical quantity that can be described by a single element of a number field such as a real number, often accompanied by units of measurement (eg. cm). A scalar is usually said to be a physical quantity that only has magnitude, possibly a sign, and no other characteristics. This is in contrast to vectors, tensors, etc. which are described by several numbers that characterize their magnitude, direction, and so on.
The concept of a scalar in physics is essentially the same as a scalar in mathematics. Formally, a scalar is unchanged by coordinate system transformations. In classical theories, like Newtonian mechanics, this means that rotations or reflections preserve scalars, while in relativistic theories, Lorentz transformations or space-time translations preserve scalars.
Scalar field Edit
Main articles: Scalar field and Scalar field theory
Since scalars mostly may be treated as special cases of multi-dimensional quantities such as vectors and tensors, physical scalar fields might be regarded as a special case of more general fields, like vector fields, spinor fields, and tensor fields.
Physical quantity Edit
Main article: Physical quantity
A physical quantity is expressed by a numerical value and a physical unit, not merely a number. Its quantity may be regarded as the product of the number and the unit (e.g. for distance, 1 km is the same as 1000 m). Thus, following the example of distance, the quantity does not depend on the length of the base vectors of the coordinate system. Also, other changes of the coordinate system may affect the formula for computing the scalar (for example, the Euclidean formula for distance in terms of coordinates relies on the basis being orthonormal), but not the scalar itself. In this sense, physical distance deviates from the definition of metric in not being just a real number; however it satisfies all other properties. The same applies for other physical quantities which are not dimensionless.
Answer:
Scaler quantity are those quantity which depends only on magnitude but not the direction .
ex - speed is a scaler quantity but velocity is a vector.
Explanation:
Hope the answer will help you