The verb dissipate has 4 senses (first 3 from tagged texts)
1. (1) disperse, dissipate, dispel, break up, scatter -- (to cause to separate and go in different directions; "She waved her hand and scattered the crowds")
2. (1) disperse, dissipate, scatter, spread out -- (move away from each other; "The crowds dispersed"; "The children scattered in all directions when the teacher approached";)