Science, Tech, Math › Science Molar Definition in Chemistry (Unit) Share Flipboard Email Print In chemistry, molar is a unit of concentration in terms of moles per liter. Sean Russel / Getty Images 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 07, 2019 Molar refers to the unit of concentration molarity, which is equal to the number of moles per liter of a solution. In chemistry, the term most often refers to molar concentration of a solute in a solution. Molar concentration has the units mol/L or M.Molar also refers to other measurements dealing with moles such as molar mass, molar heat capacity and molar volume. Example A 6 molar (6 M) solution of H2SO4 refers to a solution with six moles of sulfuric acid per liter of solution. Remember, the volume refers to liters of solution, not liters of water added to prepare the solution. Sources Tro, Nivaldo J. (2014). Introductory Chemistry Essentials (5th ed.). Pearson. Boston. ISBN 9780321919052.