એકમ

વિકિપીડિયાથી
આના પર જાવ: ભ્રમણ, શોધો

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એકમએ રાશિના માપ માટે સખ્યા સાથે વપરાય છે. દાત ૨૦ મીટર લમ્બાઇ. અહિયા મીટર ઍ લમ્બાઇ(કોઈ વસ્તુના અન્તિમ બિન્દુઓ વચ્ચેનુ અન્તર)નો એકમ(Indian weights and measures) છે.

વિવિધ રાશિઓના એકમ નીચે બતાવ્યા છે:

મૂળભૂત રાશિઓ


અંતર === મીટર

દળ === કિલોગ્રામ

તાપમાન === સેન્ટિગ્રેડ

સમય === સેકન્ડ


મૂળભૂત પરથી તારવેલ રાશિઓ

ક્ષેત્રફળ === ચોરસમીટર, હેકટર, વિઘા

કદ(ઘનફળ) === ઘનમીટર, લિટર, ગેલન

ગતિ(ઝડપ) === કિલોમીટર/કલાક


એકમ માટેની આતરરાષ્ટ્રીય પ્રણાલી -SI (International System of Units):[ફેરફાર કરો]

રાશીઓ અને પૂર્વગો[ફેરફાર કરો]

The International System of Units consists of a set of units together with a set of prefixes. The units are divided into two classes—base units and derived units. There are seven base units, each representing, by convention, different kinds of physical quantities.

SI base units[૧][૨]
એકમ નામ એકમ સંજ્ઞા રાશિ નામ રાશિ સંજ્ઞા Dimension symbol
મીટર (metre) m લંબાઈ l (a lowercase L), x, r L
કિલોગ્રામ (kilogram) [note ૧] kg દળ m M
સેકન્ડ (second) s સમય t T
એમ્પિયર (ampere) A વિધ્યુતપ્રવાહ (electric current) I (an uppercase i) I
કેલ્વિન (kelvin) K થર્મોડાયનેમિક તાપમાન T Θ
કેન્ડેલા (candela) cd જ્યોતિતીવ્રતા Iv (an uppercase i with lowercase non-italicized v subscript) J
મોલ (mole) mol દ્રવ્ય નો જથ્થો n N
Note
  1. Despite the prefix "kilo-", the kilogram is the base unit of mass. The kilogram, not the gram, is used in the definitions of derived units. Nonetheless, units of mass are named as if the gram were the base unit.

Derived units are formed from multiplication and division of the seven base units and other derived units[૩] and are unlimited in number;[૪] for example, the SI derived unit of speed is metre per second, m/s. Some derived units have special names; for example, the unit of resistance, the ohm, symbol Ω, is uniquely defined by the relation Ω = m2·kg·s−3·A−2, which follows from the definition of the quantity electrical resistance. The radian and steradian, once given special status, are now considered dimensionless derived units.[૩]

A prefix may be added to a unit to produce a multiple of the original unit. All multiples are integer powers of ten, and beyond a hundred(th) all are integer powers of a thousand. For example, kilo- denotes a multiple of a thousand and milli- denotes a multiple of a thousandth; hence there are one thousand millimetres to the metre and one thousand metres to the kilometre. The prefixes are never combined, and multiples of the kilogram are named as if the gram was the base unit. Thus a millionth of a metre is a micrometre, not a millimillimetre, and a millionth of a kilogram is a milligram, not a microkilogram.

ઢાંચો:SI-Prefixes

In addition to the SI units, there is also a set of non-SI units accepted for use with SI, which includes some commonly used non-coherent units such as the litre.

સંદર્ભ[ફેરફાર કરો]

  1. Barry N. Taylor & Ambler Thompson Ed. (2008). The International System of Units (SI). Gaithersburg, MD: National Institute of Standards and Technology. pp. 23. http://physics.nist.gov/Pubs/SP330/sp330.pdf. પુનર્પ્રાપ્ત 18 June 2008.
  2. Quantities Units and Symbols in Physical Chemistry, IUPAC
  3. ૩.૦ ૩.૧ Ambler Thompson and Barry N. Taylor, (2008), Guide for the Use of the International System of Units (SI), (Special publication 811), Gaithersburg, MD: National Institute of Standards and Technology, p. 3.
  4. ઢાંચો:SIBrochure8th