Now, previously we said that Km is known as the Michaelis constant. And we also said that the Michaelus constant has units of molarity. So the units of Km is the same as the units of the substrate concentration. In fact, inside our body, all the different enzymes have a Km value that range from about 0.1 molar to about tenths to negative seven molar. So we see that the Km value, the magnitude of the Km value, depends not only on the type of enzyme and the type of substrate, but it also depends on the conditions in the environment. So by changing, for example, the PH or the temperature of the environment, we can affect the value of Km.