Oxygen in the air. The percentage of oxygen in the air can be measured by passing a known volume of air over hot copper, and measuring the decrease in volume as the oxygen reacts with it. Here are the equations for this reaction: copper + oxygen â copper oxide. 2Cu + O2 â 2CuO.
Get ready - World Backup is March 31st! About World Backup Day is a day for people to learn about the increasing role of data in our lives and the importance of regular backups.
1 Berkeley-- A holistic celebration of Earth Day is the inspiration for the Fifth Annual Berkeley Vegan Earth Day Sunday, April 19, from 9:30 a.m. to 3:00 p.m. at the David Brower Center, (Directions).