아주아주 작은 힘 측정하는 방법
Veritasium 한국어 - 베리타시움 · 13:40
At NIST's small-mass and small-force lab, a researcher shows how mass measurements scale down from the kilogram. Steel test weights reach 1 milligram and a handmade weight reaches 10 micrograms. Below that, electrosta...