The atmosphere becomes less dense as altitude increases because there is less weight on the air molecules, making them less compressed. The air at lower altitudes is denser because it is pressed down by the weight of all the air molecules above. Also, the further away air molecules are from the Earth, the less weight they have because of a lower gravitational pull.Know More
At higher altitudes, fewer molecules are present in the air, according to Altitude.org. There are fewer oxygen molecules, which makes breathing more difficult. In fact, planes fly at such a high altitude that they need to be artificially pressurized so that passengers can breathe.
Atmosphere density depends not only on altitude but on temperature and weather as well. Warm air is less dense than cool air because when heated, the atoms in air molecules become more active and take up more space. Weather ushers in high or low pressure systems that also affect the density of the air. Water vapor decreases the density of air because water molecules take up space that nitrogen and oxygen would normally occupy, and the weight of water in its gaseous state is lighter than that of the equivalent nitrogen and oxygen atoms.Learn more about Atmosphere
Atmospheric pressure decreases as altitude increases. High altitudes contain less air molecules, resulting in lower air density, decreased temperatures and lower air pressure. High altitudes are typically found above sea level.Full Answer >
The circulation of air in the atmosphere is caused by the rotation of the Earth and energy from the Sun as warm air rises and the colder air sinks. Large scale air movement in the atmosphere is called atmospheric circulation.Full Answer >
According to the National Center for Atmospheric Research, wind exists because of the movement of air and the differences in air pressure within the atmosphere. When high-pressure air moves toward low-pressure air, the difference in pressure leads to a faster air current or stronger wind.Full Answer >
Since the exosphere is the topmost layer of Earth's atmosphere, the air in it is very thin as it slowly fades into outer space. The air in the exosphere has multiple similarities to the vacuum of space, and it is generally characterized by the existence of light atmospheric gases like helium and hydrogen alongside trace amounts of atomic oxygen and carbon dioxide.Full Answer >