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The acronym `` SI '' is derived from the French Systeme International . It is an intriguing fact that some physical quantities are more fundamental than others and that the most fundamental physical quantities can be defined only in terms of the procedure used to measure them . The units in which they are measured are thus called fundamental units . In this textbook , the fundamental physical quantities are taken to be length , mass , time , and electric current . All other physical quantities , such as force and electric charge , can be expressed as algebraic combinations of length , mass , time , and current -LRB- for example , speed is length divided by time -RRB- ; these units are called derived units .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.