PDA

View Full Version : Scales now wrong, air heavier than thought



Evan
2004-Nov-22, 10:00 PM
It has been found that the value used for the argon content of air has been set wrong since 1969. This has an impact on all precision non vacuum scales as it means that masses of different densities have a bouyancy value that varies with the density differently than thought. I wonder if this slightly different density for air has any impact on ground based astronomy?

Metrologia article (http://www.iop.org/EJ/abstract/-search=7622024.1/0026-1394/41/6/006)

frogesque
2004-Nov-22, 10:12 PM
Hmm.. could be serious if it affects how many pan drops I get in a 250g bag :lol:

Possibly might affect some sensitive experiments (eg looking for gravity waves) but for most of our observations it's the air quality and viewing that are important. For minor variations in air density and refractive index it's simple enough to give the focusing a whack!