Now, what does this tell us? Well, to gain a better understanding about what this tells us, we have to talk about a concept called effusion. But before we talk about that, notice that velocity one will be greater if m one is smaller. And likewise, velocity two will be greater if m two is smaller. And we'll see that more clearly in the process of infusion. So infusion is the movement of gas particles or molecules from high pressure to low pressure via a very, very tiny hole.