 Now, let us discuss few pointers on problem solving, point number one, okay, point number one is your add plus rho g h y is constant. So, you are going to use only these two equations, nothing else. So, what you should do? You should not think on which equation to use, very complicated. You should know between which two points are applying these two equations. In which two points are applying, you should know where is like this, these equations, alright? And most of the time, you are just playing around with these two equations only. You don't need to worry about anything else. And the numerical will be straight forward if you understand these few things with respect to problem solving, you are going to get any numerical in this topic. And why only couple of things I have talked about in problem solving, because there are no other things to talk about. There are just these couple of things that you need to take care of, okay? Ask you a question, tell me. The water flow from is more or less than the pressure on the tank. Is the pressure at the tap? So, inside the tap, outside the tap, the numerical. So, you should be knowing exactly which two points you are talking about. So, just choosing two points itself is when to do that. So, let us take few numericals now and finding the velocity. Equation one, V2 square. That side, it becomes rho g h. What is rho g h? So, the power minus half. 2 g h is what it says, okay? Understand? Now, tell me. 2 g h. So, velocity. These scientists have understood how you are going to see when you solve numericals. So, don't get confused. Volumetric. Now, what? Demonstration. It is a law. You can use it anyway.