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.
Earth Overshoot Day is an initiative of Global Footprint Network, an international think tank that coordinates research, develops methodological standards and provides decision-makers with tools to help the human economy operate within Earthâs ecological limits.