Hildebrand's Law is a principle in chemistry that helps predict how substances will mix based on their molecular properties. It states that "like dissolves like," meaning that polar solvents, such as water, will dissolve polar solutes, while nonpolar solvents, like oil, will dissolve nonpolar solutes. This is due to the interactions between molecules, where similar types attract each other more effectively. The law is named after Rudolf Hildebrand, an American chemist who contributed significantly to the understanding of solubility and molecular interactions. By applying Hildebrand's Law, scientists can better understand and design mixtures in various fields, including pharmaceuticals and materials science.