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