Units and dimensions
PEGUS EXPEDITION YOUTUBE Hi friends welcome to Pegus Expedition and this blog is for the theoritical topics of the chapter units and dimensions. The topics which have not been discussed in video are 1-Dimensional formula 2-Significant figures 1-Dimensional formula Dimensional formula of a physical quantity is the formula which tells us how and which of the fundamental units have been used for the measurement of that quantity. An equation written in the following manner is called dimensional equation. Area = [M 0 L 2 T 0 ] How to Write Dimensions of Physical Quantities:- Dimensions of a physical quantity can be determined as follows: (a) Write the formula for that quantity, with the quantity on L.H.S. of the equation. (b) Convert all the quantities on R.H.S. into the fundamental quantities mass, length and time. (c) Substitute M,L, and T for mass, length and time respectively. (d) Collect terms of M,L and T and find their resultant powers (a,b,c) w