 So in this chapter, you will see there are which you might not have heard before, okay? Please keep quiet, okay? So these units may be from my strategist chapter, may be from modern physics chapter, okay? So you will keep on hearing terms like, you know, plans, constant, then magnetic intensity, okay? Things like that. So every physical unit has a dimension, even these have dimensions, okay? Now since we have not learned them, so probably dimensions yet. Getting it, they are dimensions of just mass, length and time. You may have to use the ampere and things like that, okay? So it is okay that you are not getting those questions, alright? Those we are going to learn, these units you are going to learn later on, okay? But then this chapter doesn't assume that you don't, okay? So basically when you do those chapters, then I give you to solve a few questions related to this chapter. Getting it, something which you know you should get it as in the units which you are aware of, but you are not able to solve it. Do you have any doubts? Question number 1 to 10, any doubts? We didn't want to. Quickly the velocity is there. So it is radians, okay? But if then what dimension? So angle expression? T minus 2. T minus 2, simply T minus 2. It's r cross into linear momentum dimensions of that, okay? So you will learn about angular momentum in a chapter. Get it? I mean there is nothing conceptual as such which you don't know, which will stop your equation. Reduce the fluids. Which one? 24. What is the 24? 24. So gas constant r will be equal to dimension of t into v divided by t. Get it? You can check that. Force divided by area, dimension of that, into dimension of volume. Let me solve it. Dimension of pressure is dimension of force divided by dimension of area into dimension of volume. So force unit is what? Mass times acceleration m into t minus 2 divided by n minus 1. This is the dimension, okay? 26 dimension of magnitude flux density. If you have a number, dimension less, okay? So if you write this must be dimension less, okay? If you write sign of anything inside the bracket, this thing must be an angle dimension less. This much power potential difference. In class 10, one chapter is iso different chapters in the physics. All questions which test you on multiple chapters together in a single question. Okay? So we learn the class 12. What else? Stevens constant will come in thermodynamics. Okay? You learn heat transfer that comes in. There is this formula. Is sigma e a temperature ratio power 4. This is Stevens constant, sigma. Now that I have given you this formula. Find the dimension of Stevens constant, sigma. All of you, try this out. Dimension less. E is a ratio. It's a dimensionless quantity. Find out. A is area. Yes, A is area. T is temperature. A is area. All of us are temperature. E is dimensionless. Focus here. Basic dimension. You can't use dimension of energy. Dimension of Stevens constant, sigma.