What is the Kármán line fundamentally considered, rather than a physical phenomenon?
Answer
An internationally accepted convention or definition
It is crucial to understand that the Kármán line at 100 kilometers is not an abrupt, physically observable event. The transition from the lower atmosphere to the vacuum of space is gradual, meaning there is no sudden, measurable physical property change occurring exactly at that altitude. Instead, the boundary is an arbitrary, though highly useful, convention established through agreed-upon reasoning based on aerodynamic performance requirements. Its value lies in its utility as a clean, objective threshold for international law and engineering practice.
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