Physical quantities and units

Jun 17th, 2015
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Physical quantities: Any thing that can be measured is called a physical quantity. Length, mass (quantity of matter), time, temperature, area, volume, density etc are examples of physical quantities. Unit: Units are used to express measurements of physical quantities. For example unit for measuring distance (length) can be meter, unit for measuring mass

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DPS Mathura Road, New Delhi.Demonstration notes for 9th Std Physics. Session 2008-09Motion Basic Concepts:-Physical quantities:Any thing that can be measured is called a physical quantity. Length, mass (quantity of matter), time, temperature, area, volume, density etc are examples of physical quantities.Unit: Units are used to express measurements of physical quantities. For example unit for measuring distance (length) can be meter, unit for measuring mass can be kilogram etc.S.I. Units:For comfortable and uniform scientific affairs all over the world, there is a standard international system of units (S.I.) Following are some physical quantities and their corresponding S.I. units.Physical quantityS.I. unitlength (distance)metre (m)masskilogram (kg)Timesecond (s)Temperaturekelvin (K)Multiples and submultiples of units:To express measurements using comfortable figures, multiples and submultiples of units are also used. For example very small distance between two points on our note book can be better expressed as 5 c.m. rather than expressing as 0.05 m. Similarly, the distance between two cities can be better expressed as 2500 km. rather than expressing as 2500000 m. So here kilo and centi are multiple and submultiple of metre.Magnitude of a Physical quantity:-Magnitude in very simple words means size or amount expressed after measurement of a physical quantity. For example 3Kg is more magnitude of mass than 2Kg. 3 Km is more magnit

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