Earth’s atmosphere is about 300 miles (480 kilometers) thick, but most of it is within 10 miles (16 km) the surface. Air pressure decreases with altitude. At sea level, air pressure is about 14.7 pounds per square inch (1 kilogram per square centimeter). At 10,000 feet (3 km), the air pressure is 10 pounds per square inch (0.7 kg per square cm).
May 05, 2015 · The Atmosphere. The Earth is a sphere with a roughly 8000 mile diameter; the thickness of the atmosphere is about 60 miles. In this picture, taken from a spacecraft orbiting at 200 miles above the surface, we can see the atmosphere as the thin blue band between the surface and the blackness of …
Thin Atmospheres. Ninety-nine percent of the Earth’s atmosphere is composed of life-supporting oxygen and nitrogen, and 98 percent of these gases are in the lower 30 kilometers (19 miles) of the atmosphere due to gravity. Another celestial body, Europa, a moon of Jupiter, likewise has a thin atmosphere with abundant oxygen,
Titan is the only moon in our Solar System to have such a thick atmosphere, which is more than seven times as massive as Earth’s atmosphere when adjusted for surface area.
The halfway point, where half the mass of the atmosphere is below and half above occurs at 5.5 kilometers. Another interesting fact is that when you are cruising in a modern jet transport at 11 kilometers, you are above 77.5 percent of the atmosphere. The total mass of the atmosphere turns out to be 5.3 zettagrams (5.3 Zg).