The gas laboratory

There are gases everywhere around us. The two essential gases for living organisms are oxygen and carbon dioxide (CO2). These two gases are found in the air as well as in the water. Land-living organisms, as humans, breathe oxygen from the air; fish breathe oxygen from the water.
Carbon dioxide is produced by animals and humans. It's coming out in the air from our lungs and into the water as the water flow through the fish's gills. Plants assimilate carbon dioxide in the photosynthesis in order to build carbohydrates.
Carbon dioxide can also be used to make different kinds of sparkling drinks. If you shake and open a soda, the gas will leave the bottle as bubbles. You can see these bubbles!

What happens if gas leaves the water and the content of oxygen is lowered, how do you think this might affect the fish living in the water?

The assignment find out the answers!

  • How does temperature affect the amount of gas in the water
  • How does salinity (salt) affect the amount of gas in the water
  • Why cannot oxygen be used to make bubbly water?




Let's investigate these questions in the lesson that follows >>