õhuhapniku

õhuhapniku is an Estonian term that translates to "airborne oxygen." It refers to the oxygen molecules present in the Earth's atmosphere. Oxygen is a vital element for most life on Earth, playing a crucial role in respiration for animals and plants. The atmosphere is composed of approximately 21% oxygen.

This airborne oxygen is a product of photosynthesis, a process carried out by plants, algae, and cyanobacteria. They absorb carbon dioxide and water, and using sunlight as energy, convert them into glucose and oxygen. This oxygen is then released into the atmosphere, replenishing the supply that is consumed through respiration and combustion.

The concentration of airborne oxygen is essential for maintaining a healthy biosphere. Significant fluctuations in its levels can have profound impacts on ecosystems and the organisms within them. Industrial processes and human activities can also influence atmospheric oxygen levels, although natural processes are the primary regulators. Understanding õhuhapniku is fundamental to comprehending atmospheric science and the delicate balance of Earth's life support systems.