noun
microparticle; atom; molecule
Scientific term for very small particles, including atoms and molecules. Used in physics and chemistry contexts.
微分子の動きを観察する実験を行った。
We conducted an experiment to observe the movement of microparticles.
この理論は微分子レベルでの相互作用を説明する。
This theory explains interactions at the microparticle level.
原子 specifically means 'atom'. 微分子 is a broader term that can include atoms, molecules, and other tiny particles.
Compound of 微 (び, 'minute, tiny') and 分子 (ぶんし, 'molecule, particle'). The exact origin is uncertain, but it likely arose in scientific contexts to refer to very small particles.