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.
Five Methods:Getting EngagedCaring for Trees, Plants and AnimalsEating Earth-Friendly FoodReducing WasteSaving Energy and WaterCommunity Q&A. The celebration of Earth Day is on April 22nd and it began 1970. It has grown into a global event recognized by over 192 countries. Devoting special a day to helping for the earth is a way to demonstrate how much we care about the future of our planet.