火箭加速升空的过程中,动能增大,重力势能增大,机械能增加.此过程中,燃料燃烧将化学能转化为内能,内能再转化为机械能,使机械能增加,遵循能量守恒定律.在空气中释放氢气球,氢气球也将加速上升,它的动能增大,重力势能增大,机械能增加,此过程中没有燃料燃烧,无能量转化,增加的机械能从哪里来?该现象还遵循能量守恒定律吗? As the rocket accelerates and ascends to the air, the kinetic energy increases, the gravitational potential energy increases, and the mechanical energy increases. In this process, the fuel combustion converts chemical energy into internal energy, internal energy into mechanical energy, and increases mechanical energy, following the law of conservation of energy. Release hydrogen balloon in the air, the hydrogen balloon will also accelerate, its kinetic energy increases, the gravitational potential energy increases, and the mechanical energy increases. In this process, there is no fuel combustion, no energy conversion, where does the increased mechanical energy come from? This phenomenon also follows Is the law of conservation of energy?