Where the atmosphere meets space in the surface of this ocean of air?

The boundary where the atmosphere meets space is known as the Kármán line, located at an altitude of about 100 kilometers (62 miles) above sea level. This demarcation signifies the transition from the Earth's atmosphere, where aerodynamic lift is possible, to the vacuum of space, where traditional flight becomes unfeasible. Above this line, the atmosphere becomes increasingly thin, with fewer gas molecules and pressure, leading to the conditions of outer space.