Follow Slashdot blog updates by subscribing to our blog RSS feed

 



Forgot your password?
typodupeerror
Science

The Changing Definition Of 'Kilogram' 964

DrLudicrous writes "The NYTimes is reporting that the platinum-iridium standard mass for the kilogram is shedding at an appreciable rate -- at least compared to other reference masses. The Pt-Ir cylinder is kept in France, and measured annually, and the slight discrepancy is important because the kg is an SI base unit- thus other quantities such as the Volt are based on it. A new standard is being sought- the two frontrunners are counting the number of atoms in a perfectly spherical single crystal of silicon, and another technique uses a device known as the Watt balance."
This discussion has been archived. No new comments can be posted.

The Changing Definition Of 'Kilogram'

Comments Filter:

"I don't believe in sweeping social change being manifested by one person, unless he has an atomic weapon." -- Howard Chaykin

Working...