The highest region of the atmosphere, where air is more than 50% likely to simply escape into outerspace?

Question

The highest region of the atmosphere, where air is more than 50% likely to simply escape into outerspace?

Answer 1

the highest region of the atomosphere is the thermosphere...

Answer 2

Exosphere: from 500 – 1000 km (300 – 600 mi) up to 10,000 km (6,000 mi)

Ionosphere: is the part of the atmosphere that is ionized by solar radiation

Thermosphere: from 80 – 85 km (265,000 – 285,000 ft) to 640+ km (400+ mi)

Mesosphere:  from about 50 km (160,000 ft) to the range of 80 to 85 km (265,000 – 285,000 ft)

Stratosphere: from the troposphere's 7 to 17 km (23,000 – 60,000 ft) range to about 50 km (160,000 ft)

Troposphere: begins at the surface and extends to between 7 km (23,000 ft) at the poles and 17 km (60,000 ft) at the equator

Answer 3

he Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly (by molar content/volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, trace amounts of other gases, and a variable amount (average around 1%) of water vapor. This mixture of gases is commonly known as air. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation and reducing temperature extremes between day and night.

There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. Three quarters of the atmosphere's mass is within 11 km of the planetary surface. In the United States, people who travel above an altitude of 80.5 km (50 statute miles) are designated astronauts. An altitude of 120 km (~75 miles or 400,000 ft) marks the boundary where atmospheric effects become noticeable during re-entry. The Kármán line, at 100 km (62 miles or 328,000 ft), is also frequently regarded as the boundary between atmosphere and outer space.