Video: Yuav ua li cas yog tus qauv chav tsev ntawm lub sij hawm thib ob txhais nyob rau hauv lub International System of Units?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov thib ob (symbol: s, abbreviation: sec) yog lub hauv paus unit ntawm lub sij hawm hauv International System of Units (SI), feem ntau nkag siab thiab keeb kwm txhais raws li?1⁄86400 ntawm ib hnub - qhov tseem ceeb no tau los ntawm kev faib hnub ua ntej rau 24 teev, tom qab ntawd mus rau 60 feeb thiab thaum kawg mus rau 60 vib nas this txhua.
Nyob rau hauv no hais txog, dab tsi yog unit ntawm lub sij hawm nyob rau hauv lub thoob ntiaj teb system ntawm units?
International System of Units yog ib qho kev ntsuas raws li 7 lub hauv paus units: lub 'meter' (ntev), kilogram (mass), thib ob (lub sij hawm), ampere ( hluav taws xob tam sim no ), Kelvin (temperature), mole (quantity), thiab candela (kev kaj). Cov chav hauv paus no tuaj yeem siv ua ke nrog ib leeg.
Tsis tas li ntawd, qhov kev ntsuas thoob ntiaj teb yog dab tsi? Cov Thoob ntiaj teb System of Units (SI), feem ntau hu ua metric system, yog qhov thoob ntiaj teb tus qauv rau ntsuas . Cov Thoob ntiaj teb Treaty of the Meter tau kos npe hauv Paris thaum lub Tsib Hlis 20, 1875 los ntawm kaum xya lub tebchaws, suav nrog Tebchaws Meskas thiab tam sim no ua kev zoo siab thoob plaws ntiaj teb raws li World Metrology Day.
Tsis tas li ntawd, koj sau sijhawm li cas yog cov units?
Lub hauv paus chav tsev rau sij hawm yog qhov thib ob (lwm SI units yog: meter ntev, kilogram rau huab hwm coj, ampere rau hluav taws xob tam sim no, kelvin rau kub, candela rau luminous siv, thiab mole rau tus nqi ntawm cov khoom). Qhov thib ob tuaj yeem sau luv ua s lossis sec.
Kev ntsuas 1 thib ob li cas?
A Thib ob yog arbitrary unit ntawm ntsuas . Nws yog kwv yees 1 /86400 ntawm ib hnub, lossis 1 /60th ntawm ib feeb, uas yog 1 /60th ntawm ib teev, uas yog hais txog 1 / 12th ntawm lub sijhawm nruab nrab ntawm hnub sawv thiab hnub poob.
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