SI Unit: Time - second (s).xml NESTR_schema.xsd (Version 2)

SI Unit: Time - second (s)

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Description: Access the definition of the second, time FAQs, information about Professor Second, and other time-centric and SI resources.
Teaching tips:
  • 5 to 30 minutes teaching time
  • How is the second defined?
  • Time FAQs
  • Learn about Professor Second!
  • What is time?
  • What is the current Coordinated Universal Time?
Resource owner information:
  • Elizabeth Benham
  • [email protected]
  • NIST
  • 68 - Physical Measurement Laboratory (PML)
  • 680 - Physical Measurement Laboratory Office
Resource dates:
  • Created on April 12, 2010
  • Last updated on July 05, 2022
  • Reviewed on August 01, 2023
Resource type:
  • Educational Resource
Resource format:
  • Webpage
School subjects:
  • STEM: Physical Science (General)
  • STEM: Chemistry
  • STEM: Mathematics
  • STEM: Engineering
  • STEM: Biology and Life Sciences
  • STEM: Physics
  • Other: Social Sciences
Keywords:
  • time
  • SI
  • metric system
  • measurement
  • second
  • cesium
  • clock
  • frequency
Topics:
  • Other: SI Units
  • Research at NIST: Metrology
Instructional levels:
  • Intermediate (3-5)
  • Middle (6-8)
  • High School (9-12)
Target audiences:
  • Students
  • Parents
  • Educators
  • General Public
  • Technology Coordinators