In the SI metric system, what is the gram primarily used to measure?

The gram is primarily used to measure mass in the SI metric system. Mass refers to the amount of matter in an object, and the gram is a fundamental unit of mass within the metric system. Understanding mass is essential in various fields, including physics, chemistry, and engineering, as it influences weight, density, and overall physical properties of materials.

In contrast, other options like length, volume, and temperature have specific units assigned to them within the metric system: length is measured in meters, volume in liters, and temperature in degrees Celsius or Kelvin. While these units also play pivotal roles in measurement and scientific calculations, they serve entirely different purposes than the gram, which solely quantifies mass.