Accession Number:

AD0272545

Title:

SYSTEMS OF UNITS AND CONVERSION TABLES

Descriptive Note:

Corporate Author:

ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN

Personal Author(s):

Report Date:

1962-02-01

Pagination or Media Count:

84.0

Abstract:

Some fundamental concepts of units, dimensions, and physical measurements are discussed, and illustrations of the misunderstandings that exist in the literature concerning these concepts are given. The differences between measure and physical equations are outlined, and a simple example is considered. The choice of how many and which units to use as basic is shown to be completely arbitrary, and the choice is usually made to produce maximum accuracy and convenience. Various mechanical, thermal, and electrical systems of units in common use today are presented, and an engineering ft-lbf-ampsec system is developed to describe electromagnetic problems. The history of some important physical units is traced, and the latest definitions of these units are used to obtain convenient conversion tables for various physical quantities.

Subject Categories:

  • Information Science

Distribution Statement:

APPROVED FOR PUBLIC RELEASE