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 Day is a name used for 2 similar global observances. While some people celebrate Earth Day around the time of the March Equinox, others observe the occasion on April 22 each year.Earth Day aims to inspire awareness of and appreciation for earth's environment. It's not to be confused with Earth Hour.People unite on Earth Day to appreciate and respect earth's environment.hile some people celebrate Earth Day around the time of the March Equinox, others observe the occasion on April 22 each year. Earth Day aims to inspire awareness of and appreciation for earth's environment. It's not to be confused with Earth Hour. People unite on Earth Day to appreciate and respect earth's environment.