diffusive       
adjective  physics specialized uk/dɪˈfjuː.sɪv/ us/dɪˈfjuː.sɪv/
 (分子)扩散性的
relating to the process of particles (= extremely small pieces) of a substance moving and mixing together with others
  computer modelling of the diffusive process in gases 气体扩散过程的计算机模拟 
 - More examples
 - physical processes that involve diffusive and convective transport
 - Diffusive ventilation is a form of continuous gas exchange that occurs by diffusion.