What is the term for the scientific study of objects less than 1 gram?

The scientific study of objects less than 1 gram is often referred to as "microgravity research" or "microscale science." This field encompasses various disciplines, including physics, materials science, and Biology, focusing on phenomena and materials at the micro or nano scale. Researchers in this area examine the behavior of small-scale objects and their interactions, which can differ significantly from larger-scale behaviors.