We measure stuff all the time—how long, how heavy, how hot, and so on—because we need to for things such as trade, health and knowledge. But making sure our measurements compare apples with apples has been a challenge: how to know if my kilogram weight or meter length is the same as yours.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science http://bit.ly/2QdJlc2
No comments:
Post a Comment