GEOLOGY

Detailed explanation-1: -The density increases as pressure increases. Altitude and weather systems can change the air’s pressure. As you go higher, the air’s pressure decreases from around 1, 000 millibars at sea level to 500 millibars at around 18, 000 feet. At 100, 000 feet above sea level the air’s pressure is only about 10 millibars.

Detailed explanation-2: -As the atmosphere expands the further you get from the Earth’s surface, it becomes less dense and air pressure decreases. As you increase altitude (distance from Earth’s surface) in an airplane, air pressure changes.

Detailed explanation-3: -Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.

Detailed explanation-4: -As pressure increases, with temperature constant, density increases. Conversely when temperature increases, with pressure constant, density decreases. Air density will decrease by about 1% for a decrease of 10 hPa in pressure or 3 °C increase in temperature.

Detailed explanation-5: -A thinner atmosphere would ordinarily mean an overall colder Earth, the researchers said, because gases trap heat, and more gas traps more heat.