Spin (physics) discrete angular momenta despite having no orbital angular momentum. In some ways, spin is like a vector quantity; it has a definite magnitude, and it has a "direction" (but quantization makes this "direction" different from the direction of an ordinary vector). All elementary particles of a given kind have the same magnitude of spin angular momentum, which is indicated by assigning the particle a spin quantum number. The SI unit of spin is the (N·m·s) or (kg·m·s), just as with classical angular momentum. In practice, spin is given as a dimensionless spin quantum number by dividing the spin angular momentum
Quantity and time, mass and force, temperature, energy, and quanta. A distinction has also been made between intensive quantity and extensive quantity as two types of quantitative property, state or relation. The magnitude of an "intensive quantity" does not depend on the size, or extent, of the object or system of which the quantity is a property, whereas magnitudes of an "extensive quantity" are additive for parts of an entity or subsystems. Thus, magnitude does depend on the extent of the entity or system in the case of extensive quantity. Examples of intensive quantities are density and pressure, while examples of