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What is Time?

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.
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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.
10:00
 

Flow Of Time, part 2/4
Grade: 8 - 12
10:00
 

Flow Of Time, part 3/4
Grade: 8 - 12
10:00
 

Flow Of Time, part 4/4
Grade: 8 - 12
9:00
 

Why Does Time Exist?
Grade: 8 - 12
The concept of time is so strange that it confounds the best minds. The past is different from the future. But why?
2:50
 

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.
8:55
 

Time Travel: Einstein's Big Idea (Theory of Relativity)
Grade: 8 - 12
A video about how time travel can occur.
4:15
 

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!
4:10
 

Time Travel And Einstein's Relativity Made Easy
Grade: 8 - 12
The presentation provides an easy to understand explanation of time travel and Einstein's general theory of relativity.
4:35
 

The Shape of Time
Grade: 8 - 12
The video relates light cones and the end of the universe to the shaping of time.
9:20
 

First Time Machine
Grade: 8 - 12
A theoretical physicist explains his discovery of a possible way to travel in time by applying Einstein's theory of relativity to laser light moving in a circle.
5:30
 

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