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布朗运动是胶体的重要性质之一，教科书（人教社化学室编．高级中学课本．化学．（选修）．第三册．人教社１９９１年１０月第１版）中明确指出“用超显微镜（一种特殊的显微镜，从侧面进入强光）观察溶胶，可见胶体微粒也在进行布朗运动。”胶体之所以能够进行布朗运动是由于?
Brownian movement is one of the important properties of colloids. It is stated in textbooks (Ren Xueshe’s Chemistry Department. Senior High School Textbooks. Chemistry. (Electives). Book 3. People’s Education Society, first edition, October 1991) that "Using Ultra A microscope (a special microscope, which enters the glare from the side) observes the sol, and it is seen that the colloidal particles are also undergoing Brownian motion.” Why the colloids are capable of Brownian motion?