How does the proportion of carbon dioxide in the atmosphere differ between earth and venus
The proportion of carbon dioxide in the atmospheres of Earth and Venus differs significantly.
On Earth, carbon dioxide (CO2) makes up approximately 0.04% (or 400 parts per million) of the atmosphere. While this may seem like a small percentage, it plays a crucial role in maintaining Earth's climate and supporting life. Carbon dioxide acts as a greenhouse gas, trapping some of the sun's heat and preventing it from escaping back into space. This phenomenon, known as the greenhouse effect, helps to keep Earth's average temperature at a habitable range of around 15°C (59°F).
On the other hand, Venus has a remarkably high concentration of carbon dioxide in its atmosphere, making up about 96.5% of its total atmospheric composition. With a surface temperature of approximately 470°C (878°F), Venus experiences a runaway greenhouse effect due to this extreme concentration of carbon dioxide. The thick layer of carbon dioxide traps an enormous amount of heat, leading to the hottest surface temperatures of any planet in our solar system. This makes Venus's atmosphere inhospitable for life as we know it.
In summary, while carbon dioxide is present in both Earth and Venus's atmospheres, Earth has a much lower concentration, enabling a habitable climate, whereas Venus has an overwhelmingly high concentration leading to an extremely inhospitable environment.