Time: measurement and meaning

United States, 1974

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How does time move, what is “now”, what is reverse, or “backward” time? This account of modern theoretical and practical physical science examines concepts of time dilation, the entropy principle and astronomical time, relation of subjective and external time and the definition of a second. Scientific timepieces are shown, such as an atomic clock and a waterclock, as well as a brief glimpse of a cyclotron.


production company

Encyclopaedia Britannica Films







ACMI Identifier


Subject categories

Education, Instruction, Teaching & Schools → Science - Study and teaching

Educational & Instructional

Educational & Instructional → Educational films

Educational & Instructional → Instructional

Mathematics, Science & Technology → Clocks and watches

Mathematics, Science & Technology → Physics

Mathematics, Science & Technology → Science - Study and teaching

Mathematics, Science & Technology → Space and time

Mathematics, Science & Technology → Time - Systems and standards

Mathematics, Science & Technology → Time measurements

Mathematics, Science & Technology → Time perception

Short films

Short films → Short films - United States




16mm film; Limited Access Print (Section 2)

16mm film; Access Print (Section 1)

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