The antonym for "becomes liquid" would be "solidifies". This means that a substance which was once liquid, becomes solid. For example, when water freezes, it solidifies and turns into ice. Other examples of substances that can solidify include wax, honey, and even some types of metals like lead. Solidification can occur due to a decrease in temperature or by evaporating the liquid's solvent. Solidification of certain liquids can also occur due to a chemical reaction. Understanding the antonym for "becoming liquid" is critical in various fields where solidification is necessary, such as food and beverage production, metalwork, and construction.