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.
On July 12, Amazon will host its second-annual Prime Day, which it touts as a summer answer to the mega sales that come around the holidays (a.k.a. Black Friday and Cyber Monday). The catch? Only those with Amazon Prime memberships are eligible to shop.