Which of the following correctly defines a scalar quantity?

A scalar quantity is defined as a physical quantity that has only magnitude and no direction. For example, quantities like temperature, mass, and speed are scalars; they provide a specific value (or magnitude) without indicating any direction associated with them.

In contrast, vector quantities are described with both magnitude and direction, such as velocity and force. The distinction is essential in physics since the treatment and calculations involving scalars differ fundamentally from those involving vectors. Understanding that a scalar only includes magnitude helps clarify various concepts in physics, especially when analyzing motion, waves, and thermodynamic principles.