Measurement Units - ChE Links
The Constants and Equations
Huge collection of scientific constants and equations. The term "constant" is
conceived somewhat broad though.
Conversion & Calculation
Measurement conversion, reference information and many calculators.
From Process Associates of America, conversion factors for basic physical quantities and
quantities used in chemical engineering.
Online unit converter, many different units, also unusual ones.
Unit conversion program for the most popular units of distance, temperature, volume, time,
speed, mass, power, density, pressure, energy and many others, includes the ability to
create custom conversions, freeware for Windows 95/NT 3.51 or later.
A Dictionary of Units
Summary of important measurement units and factors for converting to SI-units.
eFunda: Units and Constants
A lot of information about units and unit conversion; includes also constants, information
about SI, and unit prefixes.
From NIST, latest values of physical constants and background information.
Guide for the
Use of the International System of Units (SI)
Everything you need to know about SI. A NIST special publication, available as PDF file
From Russ Rowlett, University of North Carolina, a comprehensive dictionary of units of
measurement covering the English customary systems, the metric system, and the
International System of Weights and Measures (SI).
International System of
From NIST, essentials of the SI, background, and bibliography.
OMDI Unit Calculator
Unit conversion program for the Power Mac which supports drag and drop. Though not free
there is a fully functional, time limited demo available.
Unit conversion software for Windows 98/ME/NT/2000. Includes metric system, imperial
system, US customary system, CGPM standard units and others. Free evaluation copy
available for download. Full version costs US$16.95.
A freeware units conversion program specifically for engineers, runs under Windows 9x/NT
(or later), from Katmar Software.
From NIST, essentials of expressing measurement uncertainty.
Free unit converter for Windows platforms from ESSCo. Commercial Windows API and COM
versions for embedding unit conversions in user applications are also available.
By: Dr. Bernhard Spang, Associate Content Writer (read the author's Profile)