by the end of this chapter students are able to use appropriate unit and unit prefixes in calculations of physical quantities perform unit conversions then eta here manipulate the dimensional analysis to determine the s-i unit of physical quantities and to prove the validity of the equations physics upper into physics physics is the study of physical objects and natural phenomena such as heat light current process movement physics objects of doing experiments to observe how nature is related to the law and principles of physics experiments any numbers that used to describe quantitative comparisons is called a physical quantity the leader of physics is a physical quantity quantity physics physical quantities can be divided into base quantities and derive quantities so say i can explain what canada and base quantities that you got derived quantity surpassing standard of length mess and time the measurement of any quantity is made relative to a particular standard at open okay the same like this extended for any unit we need to define the standards the most common unit used by scientists and engineers around the world is international systems scientists done engineering okay to your base quantity length time tempo electric carbon electric temperature amount of substance uh b lung answers are the substance that you is [Music] [Music] [Music] is a physical quantity derived from base quantities through multiplication division or a combination of both operations derived quantity quantity by the best quantity again [Music] quantity