"මිනුම් ක්‍රම" හි සංශෝධන අතර වෙනස්කම්

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136 පේළිය:
Both [[Imperial unit]]s and [[United States customary units|U.S. customary units]] derive from earlier [[English unit]]s. Imperial units were mostly used in the [[Commonwealth of Nations|British Commonwealth]] and the former [[British Empire]] but in most Commonwealth countries they have been largely supplanted by the metric system. They are still used for some applications in the United Kingdom but have been mostly replaced by the metric system in [[commerce|commercial]], [[scientific]], and [[industry|industrial]] applications.
 
U.S. customary units, however, are still the main system of measurement in the [[United States]]. While some steps towards [[metrication]] have been made (mainly in the late 1960s and early 1970s), the customary units have a strong hold due to the vast industrial infrastructure and commercial development. The effort is proceeding slowly due to the overwhelming financial cost of converting the existing infrastructure. U.S. companies which trade internationally are more likely to use the metric system due to international standards and certifications such as [[ISO9000]]. The metric system is preferred in certain fields such as [[science]], [[medicineවෛද්‍ය විද්‍යාව]], [[technology]] and the [[Armed Forces of the United States|military]]. The building profession uses US customary units, though architects working internationally are increasingly adapting to the metric system.
 
While imperial and US customary systems are closely related, there are a number of [[Comparison of the imperial and US customary measurement systems|differences between them]]. Units of length and area (the [[inch]], [[foot]], [[yard]], [[mile]] etc.) are identical except for surveying purposes. The [[Avoirdupois]] units of mass and weight differ for units larger than a [[pound (mass)|pound]] (lb.). The Imperial system uses a stone of 14 lb., a long [[hundredweight]] of 112 lb. and a long [[ton]] of 2240 lb. The stone is not used in the U.S. and the hundredweights and tons are short being 100 lb. and 2000 lb. respectively.
147 පේළිය:
[[Natural units]] are [[Physics|physical]] [[units of measurement]] defined in terms of universal [[physical constants]] in such a manner that some chosen physical constants take on the numerical value of one when expressed in terms of a particular set of natural units. Natural units are natural because the origin of their definition comes only from properties of [[nature]] and not from any human construct. Various systems of natural units are possible. Below are listed some examples.
 
* [[Geometrized unit system|Geometric unit systems]] are useful in [[Theory of relativity|relativistic physics]]. In these systems the base physical units are chosen so that the [[speed of light]] and the [[gravitational constant]] are set equal to unity.
* [[Planck units]] are a form of geometric units obtained by also setting [[Boltzmann's constant]], the [[Coulomb's law|Coulomb force constant]] and the [[reduced Planck constant]] to unity. They might be considered unique in that they are based only on properties of [[free space]] rather than any prototype, object or particle.
* [[Natural units#Stoney units|Stoney units]] are similar to Planck units but set the [[elementary charge]] to unity and allow Planck's constant to float.
"https://si.wikipedia.org/wiki/මිනුම්_ක්‍රම" වෙතින් සම්ප්‍රවේශනය කෙරිණි