International Journal of Engineering and Information Systems (IJEAIS)   Year: 2021 | Volume: 5 | Issue: 7 | Page No.: 13-17 Solving Gas Diffuses Phenomenon Using Variational Technique Ameera N. Alkiffai; Zainab M. Reda Abstract: -- This scientific study is concerned with an integral equation, especially with Volterra integral equation and used new variational formulation which corresponds on the linear operator Lu = f . The gas diffuses phenomenon has been solved using this variational formulation.