There isn't a specific scientific unit for inertia itself. This is because inertia is a property of matter, not a quantity that can be measured directly.

However, mass is a direct measure of an object's inertia. The more massive an object is, the more inertia it has. The standard unit for mass is the kilogram (kg).

Here's why inertia doesn't have its own unit:

* Inertia is a concept: It describes the tendency of an object to resist changes in its motion.

* Inertia is proportional to mass: The greater the mass, the greater the inertia.

* Mass is a quantifiable property: We can measure mass in kilograms.

Therefore, instead of having a separate unit for inertia, we use the unit for mass (kilogram) to represent the inertia of an object.