阿那克西曼德的学生，认为“气”是宇宙的本原。通过“凝聚”和“稀薄”的过程，空气演变成为火、水、土、石等不同物质。
Student of Anaximander and the third master of the Milesian school. He sought to bridge his teacher's abstract Apeiron and Thales' concrete water with a principle that could be explained through observable physical processes.
Anaximenes held that air (pneuma) is the sole arche of the cosmos, carrying life-sustaining and spiritual qualities. He proposed the mechanisms of condensation and rarefaction: when air rarefies it becomes fire, and when it condenses it successively becomes wind, cloud, water, earth, and stone. This was the first attempt to reduce qualitative diversity to quantitative physical processes, laying early groundwork for mechanistic reductionism.
"Just as our soul is air and holds us together, so the whole cosmos is sustained by breath and air."
生命依靠呼吸存活，灵魂在古希腊语中最初正是‘呼吸、气’。当你深呼吸时，是否能体会到自己体内的每一次吐纳，实际上正在跟包容整片地球的物理高空进行着最亲密的质料交换？
Anaximander's Apeiron was too abstract to describe its physical process of separation. Anaximenes introduced air with the mechanisms of rarefaction and condensation, making the arche hypothesis observable and capable of explaining qualitative change through quantitative variation.
Is a perfect but mechanism-deficient ultimate hypothesis, or a humble but testable mechanical model with concrete transformation chains, more valuable in the history of scientific inquiry?
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