A dipole consists of two equal and opposite charges separated by a small distance. In chemistry it usually refers to the partial positive and partial negative charges at the two ends of a polar bond or molecule. The size of a dipole is expressed by its dipole moment.

偶极由相隔一小段距离的两个等量异号电荷组成。在化学中,它通常指极性键或极性分子两端的部分正电荷与部分负电荷。偶极的大小用偶极矩表示。