Science, Tech, Math › Science RT Definition in Chemistry What Does RT Mean in Chemistry? Share Flipboard Email Print In chemistry, room temperature often has a defined value. Peter Dazeley / 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 May 06, 2019 RT Definition: RT stands for room temperature.Room temperature is actually a range of temperatures from 15 to 25 deg;C corresponding to temperatures comfortable to people. 300 K is a generally accepted value for room temperature to simplify calculations.The abbreviations RT, rt, or r.t. are commonly used in chemical equations to denote the reaction can be run at room temperature. Because room temperature does not have a fixed value, it's better to record the temperature at the time data is taken.