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.
Amazon to launch 'Prime Day' sale next week. In honor of the retailing giant's 20th birthday, Amazon is hosting a sale next week that it says will rival Black Friday. The event, called Prime Day, is exclusive to Amazon Prime members. Waldy Diez, Shannon Rae Green, Brett Molina. 25111 CONNECTTWEETCOMMENTEMAILMORE. In honor of the retailing giant's 20th birthday, Amazon is hosting a sale next week that it says will rival Black Friday.