You are absolutely correct! A Newton-meter (Nm) is a unit of torque, not mass.

Here's why:

* Torque: Torque is a rotational force. It measures how much a force tends to rotate an object around a specific axis.

* Mass: Mass is a fundamental property of matter that represents its resistance to acceleration.

Units for Measuring Mass:

* Kilogram (kg): The standard unit of mass in the International System of Units (SI).

* Gram (g): A smaller unit of mass, 1000 grams equal 1 kilogram.

Units for Measuring Torque:

* Newton-meter (Nm): The standard unit of torque in the SI system.

Measuring Mass:

To measure the mass of an object, you would use a device like a:

* Scale: A balance that compares the object's weight to known masses.

* Balance: A device that compares the object's mass to a known mass.

Let me know if you have any more questions about physics!