antarraashtreeya ikaai pranaali ne saat SI saat mool ikaaiyaan bataayeen hain: ye bhautik ikaaiyaaain hain, jinko prachaalit paribhaashaaon dvaara paribhaashit kiya gaya hai.
anya sabhi bhautik ikaaiyaaain in mool ikaaiyon dvaara vyutpann ki ja sakti hain. inko vyutpann ikaaiyaaain kaha jaayega. unka vyutpannan aayaami vishleshan dvaara hota hai. badeesankhyaaon ke liye SI upasargon ka prayog hota hai.
nimn SI mool ikaaiyon ki soochi hai.
|meter||m||lambaai||lambaai ki ikaai barabar hai: prakaash dvaara vanirvaat mein ek saikind ke 1⁄299,792,458vein bhaag mein tay ki gayi doori ke.
baraabar 100 cm (lagbhag 39.37 inch)
paribhaashit: 17veen CGPM (1983) rijaulyooshan 1, CR 97
|pruthvi ki bhoomadhya rekha se uttari dhruv ki pairis se hote hue nyoonatam doori ka 1⁄10,000,000vaan bhaag.|
|kilogram||kg||bhaar||The unit of mass is equal to the mass of the international prototype kilogram (a platinum-iridium cylinder) kept at the Bureau International des Poids et Mesures (BIPM), Sèavres, Paris (1st CGPM (1889), CR 34-38). Note that the kilogram is the only base unit with a
||The mass of one litre of water. Kilogram was originally named "grave" and symbolized G. The gram is defined as a derived unit, equal to 1⁄1000 of a kilogram; prefixes such as mega are applied to the gram, not the kg; e.g. Gg, not Mkg. It is also the only unit still defined by a physical prototype instead of a measurable natural phenomenon.|
|saikind||s||samay||The unit of time is the duration of exactly 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium-133 atom at a temperature of 0 K.
Defined by: 13th CGPM (1967-1968) Resolution 1, CR 103
|The day is divided in 24 hours, each hour divided in 60 minutes, each minute divided in 60 seconds.
A second is 1⁄24 × 60 × 60 of the day
|empeeyar||A||vidyut dhaara||The ampere is the unit of electric current. The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 × 10–7 newton per metre of length.|
|kailvin||K||taapamaan||The unit of thermodynamic temperature (or absolute temperature) is the fraction 1⁄273.16 (exactly) of the thermodynamic temperature at the triple point of water.
Defined by: 13th CGPM (1967) Resolution 4, CR 104
|Historically, the Celsius scale was used before the kelvin. 1 degree Celsius (or degree centigrade) = 1⁄100 of the difference between the boiling and freezing points of water at sea level. The Kelvin scale uses the degree Celsius for its unit increment.|
|mol||mol||padaarth ya dravya ki maatra||A mole is the quantity of substance that contains the same number of elementary entities (atoms, molecules, ions, electrons or particles, depending on the substance) as there are atoms in 0.012 kilograms of pure carbon-12; this number (NA) is approximately equal to 6.0221415(10) × 1023 mol-1 (2002 CODATA).||one gram per atomic mass unit|
|cd||prakaasheeya teevrata||The unit of luminous intensity is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1⁄683 watts per steradian.
Defined by: 16th CGPM (1979) Resolution 3, CR 100