Report comment

Please fill in the form to report an unsuitable comment. Please state which comment is of concern and why. It will be sent to our moderator for review.

Comment

Researchers have spent quite a bit of time looking at why the mass of the standard kilograms has been drifting. They've put it down to the accumulation of air pollutants - mostly carbon and mercury. Check out https://www.chemistryworld.com/news/game-over-for-the-original-kilogram/3007760.article

Your details

Cancel