This post was authored by Joel Don, ISA's social media community manager.

This automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for more information about the CCST program.

All physical measurements arise from the fundamental quantities of:

a) mass, length, and time
b) density, viscosity, and specific gravity
c) flow, volume, and temperature
d) pressure, density, and specific gravity
e) none of the above

Click Here to Reveal the Answer

The scientific and engineering community widely accepts the Systeme Internationale d’Unites (SI). Its base units are length, mass, moles, time, temperature, electric current, and light intensity. The base units of the American engineering system are length (foot), mass (lbm), and time (second).

The best answer is A.

The other three answers have properties that derive from the base units of answer A.

About the Author
Joel Don is the community manager for ISA and is an independent content marketing, social media and public relations consultant. Prior to his work in marketing and PR, Joel served as an editor for regional newspapers and national magazines throughout the U.S. He earned a master's degree from the Medill School at Northwestern University with a focus on science, engineering and biomedical marketing communications, and a bachelor of science degree from UC San Diego.

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