|Difficulty: Intermediate 5|
|Cost ($): 90|
Time required:1 hour to prepare, 2 hours for experiment
Availability of materials:Easily found. Access to a car is required.
Be wary of carbon monoxide poisoning from the exhaust of the car. Conduct the experiment in a well ventilated garage. Adult assistance is required for the operation of the car.
Higher carbon dioxide content in the air will contribute to warmer temperatures.
Carbon dioxide is created when we burn fossil fuels like coal and gasoline. These fuels contain carbon, which combines with oxygen to produce carbon dioxide ?a by-product of the fuel burning process. This carbon dioxide is released into the atmosphere from factories, power plants, automobiles, and airplanes.
Carbon dioxide gas does not absorb energy directly from the sun. Instead, the earth releases heat energy which is absorbed by the carbon dioxide molecules. However, the carbon dioxide molecules do not store the absorbed energy for long and will release eventually release them. This energy can be directed towards outer space or return to the earth. It has been proven scientifically that the presence of carbon dioxide in the atmosphere will result in more energy being absorbed by the earth and the atmosphere of our planet, instead of the energy being released into outer space. This imbalance will cause the temperature of our planet to increase gradually by significantly over time.
Growing industrialization, and aggressive deforestation and fossil fuel burning have led to increased levels of carbon dioxide in the atmosphere for more than twenty decades. Some of this carbon dioxide is used in photosynthesis by fauna, whilst some of it dissolves into the ocean and the rest remains trapped in our atmosphere. The past 100 years has recorded a 0.74 0C increase in global temperatures.
The materials required for ths experiment:
The results show that the first tank with the normal air cools down the quickest and the third tank, with the air from the car exhaust, cools down the slowest.
Use the graph below to plot the results of above observation.
The hypothesis that a higher concentration of carbon dioxide in the air will slow down the rate at which the temperature of the air falls, is proven to be true. The heat released by the soil in the tank is captured by the carbon dioxide molecules. Some of the energy is returned to the soil and some of it is released out of the tank. Since the tank with the car exhaust gas had the highest concentration of carbon dioxide molecules, it demonstrated the slowest rate of cooling down.
The increase in carbon dioxide levels in the atmosphere has led to an increase in global temperatures. It is causing significant changes to weather patterns, the melting of polar ice (glaciers), and the rising of sea levels, causing islands to disappear. Furthermore, the increase in ocean temperatures has led to to the extinction of certain species of marine life.
The experiment can also be repeated using water to replace the soil in the tank.
Try to perform this experiment by using a hair dryer to obtain a higher starting temperature. Observe the difference in the rate of cooling.