On 24-11, a practical lecture was held as part of the Mass Transfer course for students of Petroleum and Energy Engineering Technology. The session was delivered by Eng. Abdullah Marza Hamza, focusing on the Vapour in Air Diffusion experiment. The lecture included an explanation of the principles of vapor diffusion in air and methods for measuring the diffusion rate, along with a step-by-step demonstration of the laboratory procedure. The aim was to strengthen students’ practical skills and link theoretical concepts with real engineering applications.