This probability cloud obeys a quantum mechanical principle called heisenberg ' s uncertainty principle , which states that there is an uncertainty in the classical position of any subatomic particle , including the electron ; so instead of describing where an electron or other particle is , the entire range of possible values is used , describing a probability distribution 这个概率云服从所谓的海森堡测不准原理的量子力学原理，原理表明任何亚原子微粒包括电子经典位置具有不确定性；因而代替描述电子或其它微粒所处位置，用全部范围里的概率值描述概率分布。
