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.
History of Infinity Day: August 8. Infinity Day is also known as Universal & International Infinity Day, and is a day held on the 8th day of the 8th month of each year in order to celebrate and promote Philosophy and Philosophizing for the ordinary person. 8 planets in the Solar System â since Pluto got demoted.