Ilmakehiin

Ilmakehiin is a Finnish term that translates to "atmosphere" or "air envelope" in English. It refers to the layer of gases that surround a planet or other celestial body and are held in place by gravity. The Earth's atmosphere is a crucial component of our planet, playing a vital role in supporting life. It protects us from harmful solar radiation, regulates temperature, and contains the oxygen we breathe.

The Earth's ilmakehiin is divided into several layers, each with distinct characteristics. These layers include the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The troposphere is the lowest layer, where weather phenomena occur and most aircraft fly. Above that, the stratosphere contains the ozone layer, which absorbs most of the Sun's ultraviolet radiation. Higher still, the mesosphere is where meteors typically burn up, and the thermosphere is known for its high temperatures, where auroras occur. The exosphere is the outermost layer, gradually fading into outer space.

The composition of the ilmakehiin varies depending on altitude and location. Primarily, it consists of nitrogen and oxygen, with smaller amounts of argon, carbon dioxide, and trace gases. The concentration of these gases, particularly greenhouse gases like carbon dioxide, is a subject of significant scientific study due to its influence on global climate. Understanding the ilmakehiin is essential for meteorology, climate science, and aerospace engineering, as well as for comprehending the conditions necessary for life to exist beyond Earth.