UNITS OF MEASUREMENT Many properties of matter are quantitative in nature. When you measure something, you are comparing it with some standard. The standard quantity is reproducible and unchanging. Many properties of matter such as mass, length, area, pressure, volume, time, etc. are quantitative in nature. Any quantitative measurement is expressed by a number followed by units in which it is measured. For example, length of class room can be represented as 10 m. Here 10 is the number and 'm' denotes metre-the unit in which the length is measured. The standards are chosen orbitrarily with some universally acceped criteria. ''The arbitrarily decided and universally accepted standards are called units.'' There are several systems in which units are expressed such as...
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