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What is Time?


We commonly refer to the conscious experience of a duration as time. In physics, time is a fundamental quantity, similar to length, mass, energy in that aspect. The measurement of time involves a time scale whose basic unit is the 'second'. Modern physics regards time as a fourth dimension, on an equal footing with the familiar three dimensions of space. The concept of time has perplexed the best of human minds, and it remains one of the most difficult properties of our universe to understand.
School presentations  Pictures & School Presentations :
Science videos  Science Videos & Lessons:  (Reviewed by K-12 teachers)

Flow Of Time, part 1/4
Grade: 8 - 12
The documentary tries to explain time and its meaning in the context of mathematics, relativity, and quantum mechanics.

Flow Of Time, part 2/4
Grade: 8 - 12

Flow Of Time, part 3/4
Grade: 8 - 12

Flow Of Time, part 4/4
Grade: 8 - 12

Why does Time Exist in our Universe?
Grade: 8 - 12
The concept of time confounds even the best minds. The past is different from the future. But why?

Einstein's Relativity: Time Dilation
Grade: 8 - 12
The presentation explains that everything in the universe is traveling through space-time at the speed of light - the maximum speed. If we are sitting still in space, then we are traveling through time at the maximum speed. But when we begin traveling through space, our progress through time slows down. It's a phenomenon called Time Dilation.

Time Travel: Einstein's Big Idea (Theory of Relativity)
Grade: 8 - 12
A video about how time travel can occur.

How To Time Travel
Grade: 8 - 12
Learn about time travel. So, next time you're late for school? Or, a meeting? Just take a wormhole - you'll be there before you know it!

Time Travel And Einstein's Relativity
Grade: 8 - 12
An easy to understand explanation of time travel and Einstein's general theory of relativity.

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Common Core State Standards  
Related science topics: Relativity
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