How does temperature affect the formation of efflorescence?

High temperatures play a significant role in the process of efflorescence by facilitating salt crystallization. Efflorescence occurs when soluble salts within the masonry materials are drawn to the surface by moisture moving through the substrate. As the moisture evaporates, particularly at elevated temperatures, the remaining salts crystallize and appear as white, powdery spots on the surface.

This crystallization process is more pronounced at higher temperatures because increased heat can enhance the evaporation rate of water. When the moisture content in the masonry decreases quickly due to elevated temperatures, the dissolved salts are left behind, leading to more noticeable efflorescence. Therefore, the correct understanding of this phenomenon highlights the connection between warmth and the concentration of salts at the surface that results in efflorescence.