如果地球只接受太阳辐射而不向外放出能量,那么地球的温度将会越来越高。但是,实际上地球的平均温度几乎是稳定不变的,这是什么原因呢? 从物理学知道,物体的温度只要高于绝对零度(—273.16℃),就会向周围发射辐射,辐射能密度与其绝对温度的四次方成正比,即 E=εσT~4式中,σ=5.6697×10~(-8)瓦/米~2·K~4,称为斯蒂芬-玻尔兹曼常数。地球也毫不例外,正是由于它不断向空间发射辐射能 If the earth receives only solar radiation and does not emit energy outward, then the earth’s temperature will be higher and higher. However, in fact, the average temperature of the Earth is almost constant, what is the reason? From physics to know that as long as the object temperature above absolute zero (-273.16 ℃), it will emit radiation to the surrounding radiation density Which is proportional to the fourth power of its absolute temperature, that is, E = εσT ~ 4 where σ = 5.6697 × 10 -8 W / m ~ 2 · K ~ 4, which is called the Stefan-Boltzmann constant. Earth is no exception, it is because it constantly emits radiation to space