... of the SI units will be defined by fundamental constants of nature as of 20 May 2019! #SIRedefinitionhttps://t.co/U1V0TFxXLG pic.twitter.com/xpcddbAAmV — NPL (@NPL) November 16, 2018
... of the SI units will be defined by fundamental constants of nature as of 20 May 2019! #SIRedefinitionhttps://t.co/U1V0TFxXLG pic.twitter.com/xpcddbAAmV — NPL (@NPL) November 16, 2018