The equilibrium expression turns up right across all kinds of science including chemistry, biology, and geology, but what does it REALLY mean? How are equilibrium constants and rate constants related to the equilibrium expression and reversible reactions? And what embarrassing mistake did I make early in my career? Watch to find out why the equilibrium expression is so important. Kyushu University is one of Japan’s top universities. Check out the link to learn about our science and engineering courses in English: Kyushu University is one of Japan’s top universities. Check out the link to learn about our science and engineering courses in English: Three Twentysix is produced by Dr Andrew Robertson at Kyushu University. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect those of Kyushu University.