Why would a lid of a tin be pushed of because of gas molecules?

A lid of a tin can be pushed off due to gas molecules because of the buildup of pressure inside the container. When the contents of the tin are heated or if a chemical reaction occurs, gas molecules are produced, increasing the number of gas particles. As these gas molecules collide with the lid, they exert pressure on it; if this pressure exceeds the adhesive forces holding the lid in place, the lid will be pushed off. This phenomenon is commonly observed in sealed containers when the contents undergo changes that generate gas.