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四、氧气 1.氧气的性质、用途和制取马克思主义哲学告诉我们:世界是物质的。我们这个广袤浩瀚的物质世界,正是由丰富多彩数以亿万计的物质组成的。“氧”是构成这些物质的元素之一,它的化学符号是“O”,分子式是“O_2”。在自然状态下,它是无色,无味,无毒的气体,大量存在于大气之中,按体积计算约占空气的21％。它本身不燃烧,但具有很强的助燃作用——是一种极其强烈的助燃气体。在自然界,任何一种燃烧现象,
IV. OXYGEN 1. The nature, use, and preparation of Marxist philosophy of oxygen tell us that the world is material. Our vast and vast material world consists of a rich and colorful multi-billion-dollar substance. “Oxygen” is one of the elements that make up these substances. Its chemical symbol is “O” and the formula is “O_2”. In its natural state, it is a colorless, odorless, non-toxic gas, abundant in the atmosphere, accounting for about 21% of the volume by volume. It does not burn itself, but has a strong combustion-supporting effect - it is an extremely strong combustion gas. In nature, any kind of burning phenomenon,