An explanation of the principal systems of units, their history, standards, and conversion factors for changing from one to the other.
Resource for units, weights, measures and educational information on conversions and calculations.
Niel's Timelines and Scales of Measurement List
Scientific, Engineering Unit Converter
Convert2, by Legacy Systems, is a WWW based, online tool for finding and converting scientific, engineering, and common units.
Linear measure, dry measure, liquid measure, temperature, time zones and clothing sizes.
American Society of Civil Engineers Committee on Metrication
English-Metric Measurement Converter Plus
IFP : Metric Conversion Tables
Provides information on the metric system.
Project Galactic Guide -- Metric System
United States Metric Association (USMA)
National non-profit organization, founded in 1916, which advocates U.S. conversion to the International System of Units (SI), also called the modern metric system.
With the current time available for 583 cities, worldwide.
For those interested in clocks & watches. Helpful tips and details of training courses.
The U.S. Naval Observatory is the official source of time used in the United States.
International Standard Date and Time Notation
Specifies numeric representations of date and time.
NIST Time and Frequency Division
Develops and operates standards of time and frequency
North American Time Zones and GMT
The Internet time services of CSTV and information about time metrology on the Internet.
Clock synchronization at U.Delaware
Explores the meaning of time.
The evolution of time measurement.
Current time, from the US Naval Observatory Master Clock.
Includes a graphic world timezone map
Interactive world atlas, providing information on local time and public holidays for all countries.
Friendly JavaScript interface converts length, weight, area, speed, temperature and more, into different units and unit systems.
English-Metric Measurement Converter Plus
Entisoft Units Measurement Conversion Calculator
Interactive measurement conversion calculator that also displays measurement categories, related units, and sample conversions.
Jakel, Inc.
Specializing in Science/Education Safety
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