What is coefficient of liner expansion? Md. Saifur Rahman The coefficient of linear expansion is the change in length of by one unit long when its temperature is changed by one degree.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?