Home

Home
Common Compounds
Exam Guide
FAQ
Features
Glossary
Construction Kits
Companion Notes
Just Ask Antoine!
Slide Index
Toolbox
Tutorial Index
Options
Tips

Companion Notes
Introduction
Measurement
SI base units
SI prefixes
QuizSignificant figures
Matter
Atoms & ions
Compounds
Chemical change
The mole
Gases
Energy & change
The quantum theory
Electrons in atoms
The periodic table


Home :Companion Notes :MeasurementPrint | Comment

SI base units

Quantity SI
Base Unit
English
Equivalent
Definition
length meter (m) 1 m = 39.36 in distance travelled by light in a vacuum in 1/299792458 of a second
mass kilogram (kg) 1 kg = 2.2 lbs mass of a platinum/iridium cylinder kept in Paris
time second (s) time required for 9,192,631,770 cycles of the 3.26 cm microwave line of cesium-133.
temperature kelvin (K) °F = 1.8(oC)+32 K = °C + 273.15 273.16 degree K is assigned to the triple point of water (where vapor, liquid, and ice are at equilibrium)
electric current ampere (A) amount of current flowing through each of two long parallel wires separated by 1 m that results in a force of 0.2 micronewtons per meter along the wires
luminous intensity candela (cd) luminous intensity of 1/600000 m2 of a radiating cavity at the melting point of platinum (2042 K)
amount of substance mole (mol) amount of substance that contains the same number of particles as the number of atoms in a sample of pure carbon-12 weighing exactly 12 g

Sign up for a free monthly
newsletter describing updates,
new features, and changes
on this site.
Details


General Chemistry Online! SI base units

Copyright © 1997-2005 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 06/16/05.URL: http://antoine.frostburg.edu/chem/senese/101/measurement/SIbaseunits.shtml