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0.02+ 0.00+0.01+0.01004-0.04THEORYWhat is the need for measurement of a physicquantity?What is meant by unit of a physical quantity?State different types of systems of units.What is S.I. system of units? Explain its nond |
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Answer» 1. There is aneed for measurementinphysical quantity. Without it , how can you define things. Bymeasuringaphysical quantitywe define the properties of a material which thephysical quantityis associated with. For example, distance, speed, mass, pressure, force, momentum, energy. (i) They aredefinedas theunitsof fundamentalquantities. They are independent of each other and are expressed by writing the letter of the fundamentalquantityin parentheses, e.g., Fundamentalunitsof mass, length and time are [M], [L], [T] respectively The current international standard metric system is the International System of Units (Système internationald'unitésor SI) It is an mks system based on the metre, kilogram and second as well as thekelvin, ampere, candela, and mole. The SI includes two classes of units which are defined and agreed internationally. |
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