Science, Tech, Math › Science Melting Point Definition in Chemistry Melting Point vs Freezing Point Share Flipboard Email Print At the melting point of water, both water and ice can exist. Pixabay Science Chemistry Chemical Laws Basics Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated November 06, 2019 The melting point of a substance is the temperature at which a solid and liquid phase may coexist in equilibrium and the temperature at which matter changes from solid to liquid form. The term applies to pure liquids and solutions. Melting point depends on pressure, so it should be specified. Typically, tables of melting points are for standard pressure, such as 100 kPa or 1 atmosphere. Melting point may also be called the liquefaction point. Melting Point vs Freezing Point The temperature at which a liquid changes to a solid (the reverse of melting) is the freezing point or crystallization point. The freezing point and the melting point do not necessarily occur at the same temperature. This is because some substances (e.g., water) experience supercooling, so they may freeze at a temperature much lower than they melt. So, while melting point is a characteristic property of a substance, the freezing point is not. Sources Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). CRC Press. ISBN 1439855110.Ramsay, J. A. (1949). "A new method of freezing-point determination for small quantities." J. Exp. Biol. 26 (1): 57–64.