How does tempering glass increase weight?

Tempering glass involves heating it to a high temperature and then rapidly cooling it, which increases its strength and durability. This process does not inherently increase the glass's weight; rather, the weight remains consistent with the original glass. However, after tempering, the glass may be thicker or made into a different shape, which can lead to a perception of increased weight. Additionally, if the glass is laminated or treated with additional materials for safety or insulation, the overall weight may increase due to these added components.