# Spin (angular momentum)

Angular momentum is a measure of an object's rotational motion. It is the product of the object's moment of inertia and its angular velocity.

The term "spin" is often used to refer to an object's angular momentum. What do you mean by spin angular momentum? Spin angular momentum is a measure of the rotational momentum of a spinning object. It is a vector quantity, with a magnitude equal to the object's angular momentum and a direction determined by the object's spin axis.

### Is spin actually angular momentum?

Yes, spin is actually angular momentum. Spin is an intrinsic property of a particle, meaning it does not rely on the particle's position or velocity. Angular momentum, on the other hand, is a vector quantity that does depend on the particle's position and velocity. What is the value of spin angular momentum? The value of spin angular momentum is a measure of the amount of angular momentum that is contained within a spinning object. It is usually quantified in terms of the object's rotational speed and its mass.

##### What is spin angular momentum of photon?

Spin angular momentum is a measure of the amount of "spin" or "rotational" momentum that an object has. It is a vector quantity, meaning it has both magnitude and direction.

The spin angular momentum of a photon is a measure of the amount of "spin" or "rotational" momentum that the photon has. It is a vector quantity, meaning it has both magnitude and direction.

#### What is the difference between spin and orbital angular momentum?

The main difference between spin and orbital angular momentum is that spin angular momentum is an intrinsic property of a particle, while orbital angular momentum is a property of a particle in relation to its orbit around another object.

Spin angular momentum is a measure of the amount of "spin" a particle has. This type of angular momentum is always conserved, which means that it can never be created or destroyed. It is an intrinsic property of the particle, meaning that it does not depend on the particle's position or motion.

Orbital angular momentum, on the other hand, is a measure of the particle's motion around another object. It is not an intrinsic property of the particle, but rather a property that is determined by the particle's position and motion. Unlike spin angular momentum, orbital angular momentum is not always conserved.