User talk:Vimal Vimalraj

vimal raj 1 A short summary of the basics 1.1 Physical quantities, units and working with units The value of a physical quantity Q is expressed as the product of a numerical value Q and a unit of measurement [Q]: Q = Q � [Q] (1) For example, if the temperature T of a body is quanti�ed (measured) as 25 degrees Celsius this is written as: T = 25 � o C = 25 o C; (2) where T is the symbol of the physical quantity "temperature", 25 is the numerical factor and o C is the unit. By convention, physical quantities are organized in a dimensional system built upon base quantities, each of which is regarded as having its own di- mension. The seven base quantities of the International System of Quantities (ISQ) and their corresponding SI units are listed in Table 1. Other conven- tions may have a di�erent number of fundamental units (e.g. the CGS and M