水比空气导热快。
水比空气保持热量的时间要长得多。
再生纸对水的污染比原来少了35%，对空气的污染比原来少了74%。
Recycled paper can be made with 35% less water pollution and 74% less air pollution.
声音的速度为什么在水更快，解释比在空气内。
Explain why the speed of sound is faster in water than in air.
就像在第一点提到的，这要根据你的划水频率和在水里移动手臂的能力决定，牵涉到力量和耐力。 因为水的密度比空气大很多，不断地划水需要你手臂肌肉很好的耐力。
So in order to move your hand through water which is a much heavier medium than air, it will require more strength - to do that over time requires endurance of your arm muscles.
以密度来说，从行星际到星系际空间的旅行，比从水进入空气中还激烈。
In terms of density, the voyage from interplanetary to intergalactic space is more drastic than going from water into air.
水比空气能更好的传声。
因为紫外线比0.5%新鲜的空气少点燃船搬运生产品，所以对于最大多数的冷却水申请，电晕解除是选择的方法对约1.5%为电晕为相同的能源输入释放。
For most cooling water applications, corona discharge is the method of choice because ultraviolet light produces less than 0.5% ozone versus about 1.5% for corona discharge for the same energy input.
因为水可以比空气传热快约30倍，水冷却系统允许处理器运行在更高的速度大大减少系统噪音。
Because water can conduct heat about 30 times faster than air can, a water cooling system allows the processor to run at higher speeds while drastically reducing system noise.
热空气含的水汽，比同样体积的冷空气含的水汽多。空气冷却，水汽凝结，或者又变成液态水。
Warm air can hold more vapor than the same amount of cool air. (2) water vapor condenses, or changes back to liquid water, as air cools.
水的折射指数比空气还要高，因此水和纤维之间折射的相对指数要远低于空气和纤维的相对指数。
Water has a much higher index of refraction than air, and so the relative index of refraction between water and the fiber is much lower than between air and the fiber.
水的折射指数比空气还要高，因此水和纤维之间折射的相对指数要远低于空气和纤维的相对指数。
Water has a much higher index of refraction than air, and so the relative index of refraction between water and the fiber is much lower than between air and the fiber.
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