The amount ofenergy a battery can store depends on the volumeof its electrodes, so a thin battery does not last long.
因为电池能存储的总能量依赖于它电极的体积，一个小的电池是不能长时间供电的。
2
Ok, now, we're going to look at the internal energy, and we're going to pretend that it is explicitly a function of temperature and volume.
好，我们接下来看看内能，我们假设，它是温度和体积的函数。
3
The amount ofenergy a battery can store per unit volume is increasing by 8% a year, but the needs of ever more powerful electronic devices are going up more than three times as fast.