it is dimensionally same. Of course, it is dimensionally same, because this side is (Refer Slide Time: 44:17) meter square second; this is 1 by second. What is m 0? It is meter square; square root of m 0 is meter. Area is the energy (( )) (Refer Slide Time: 44:24) No, rho g we have taken down. See that this is the interesting part. We said energy; actually, it is not energy; it is energy by rho g. So, we took energy out by taking rho g. So, it does like… What I say it here is it is proportional to energy essentially. Why bother with a constant rho g. So, that is why people take out rho g. So, then, it makes sense. You see what mean by k is that (Refer Slide Time: 44:52) I do not know the value of k, but for any 1 by n, theoretically, you know; like 1 by 10 k may be 5.53; 1 by 100 k may be something else, etcetera; it is all known. Now, similarly, mean central period T 1 – mean central period means basically the mean period. It is 2 pi – I will tell you this makes perfect sense – m 0 by m 1 see m 0 by m 1; m 1 by m 0 should be omega. See what is this? See (Refer Slide Time: 45:34) if I take m 1 by m 0, what do I get? I get the c g of that – this distance is centroid of that; first moment about that divided by the area. You can think if this centroid of this graph from this side, that is equal to omega 1. T 1 therefore is 2 pi by omega 1. So, 2 pi into m 0 by m 1. That is what is called the mean period, the mean central period. Similarly, one can