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自从有了质量概念以来,人们一直认为质量在任何时候都是不变的。爱因斯坦却提出新的见解:当物体运动时质量会增加,这时物体的总质量应等于物体静止时的质量加上这部分增加的质量。这两种质量可以相互转化;不过,根据质量守恒定律,任何一种变化,在变化前后总的质量应保持不变。原子核的β衰变发现后,却出现了意外的情况:中子放出一个电子,转变成质子,质子与电子的静止质量之和要比中子的静止质量小一些。按照相对论的观点,这部分静止质量应当转化为放出来的电子能量的增益,即相当于七十八万电子伏特的动能,可是在实验中却怎么也测不到具有这么大能量的电子。是质量守恒定律和相对论错了,
People have always believed that quality has remained constant at all times since the concept of quality. Einstein proposed new insights: When an object moves, its mass will increase. At this time, the total mass of the object should be equal to the mass of the object at rest and the increased mass of this part. These two qualities can be transformed into each other; however, according to the law of conservation of mass, any change, the total mass before and after the change should remain unchanged. After the beta decay of the nucleus was discovered, there was an unexpected situation: the neutron emitted an electron and converted it into a proton. The sum of the rest mass of the proton and electron was smaller than the rest mass of the neutron. According to the theory of relativity, this part of the rest mass should be transformed into the gain of emitted electron energy, which is equivalent to 7.8 million electron volts of kinetic energy. However, in the experiment, there was no measure of such large energy electrons. It is the law of conservation of mass and the error of relativity.