👉 Stoutening is a process in which a substance is made denser by adding water or other solutes to its surface. This can be useful for preparing materials, such as concrete, where the water content can affect its strength and durability. For example, when building walls with concrete, the material may become less dense due to added water, making it more stable in temperature changes. The process of adding water to a substance increases its density by reducing its surface area exposed to air. This is known