What is effusion? Md. Saifur Rahman The passage of gases from a region of high pressure to a region of low pressure through fine pores is called an effusion.You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?