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.
What Is World Egg Day? World Egg Day is celebrated every year on the second Friday in October and was first celebrated in 1996. Since then, people around the world have continued to celebrate eggs as an excellent, affordable source of high quality protein and their vital role in feeding people around the world. Every day, egg farmers across the globe join together in their commitment to provide high-quality eggs to help feed the worldâs hungry. Here at home, Americaâs egg farmers continue to balance their operations with firm commitments to the people they feed, the animals they care for and the environment we all share.