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氦也是组成空气的一种成分;只因它在空气中所占的比率较小,所以,通常总把它划入为“稀有气体”之列。它无色,无味,无臭。它的比重很小,仅仅比世界上最轻的氢稍微重一点点。有的制氦工厂,是设在油田地的。制氦所用的原料,乃是油田地带所喷放出来的天然气。将这种天然气洗净、冷凝、干燥、离析,即可将氦气与其他可燃气体分开;再用高压将所得的氦气压缩,即可装筒运赴各地应用。
Radon is also a component of the air; because it has a small proportion of air, it is always classified as “rare gas.” It is colorless, tasteless, and odorless. Its proportion is small and only slightly heavier than the lightest hydrogen in the world. Some of the plant-making facilities are located in oil fields. The raw materials used for making oysters are the natural gas emitted from the oil field. The natural gas can be washed, condensed, dried, isolated, and the helium gas can be separated from other flammable gases; the helium gas can be compressed by high pressure, and the helium can be loaded and transported to local applications.