What is a dimension? In 3D...and 2D... and 1D

1D - it's the new 3D!



Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

In this episode we talk about dimensions and how we know that we live in 3D (or do we?).

Music by Nathaniel Schroeder

[eiseks]

He thinks that we actually understand what he says, haha

[manikandanr]

*watches 4 hours of youtube*
*comes across this*
*shuts down and goes to sleep*

[edancoll]

This video is 80 seconds of circular definitions. It just feels like the "hot air" joke was at a higher priority than actually explaining what a dimension is.

[SumofluffyVIDS]

If we lived in a 1-dimensional universe that looked 3d, how could we travel from one point to another in so many different ways? Wouldn't we be forced to take one route because it's only a 1-dimensional line? Could someone explain?

The only explanation I can currently think of, is that there are an infinite amount of 1-dimensional dimensions to connect each point together to give the illusion of a 3-dimensional universe. I'm going to spend several weeks looking into this.

[DanTheStripe]

I've never got the idea of 1 dimensional shapes.

A 1D shape cannot exist because a line such as this: still has a vertical length even though it is incredibly small.

You know what. I would love it if you made extra videos with the math and more in depth explanations. I wouldn't watch all of them, but a lot. Because I feel like your videos are almost just like trailers that make me want to know more! I for example understand what you said about the gas but I don't understand how that proofs that we live in 3D... wouldn't it look like that aswell if we were in a curled up 2D world?

That being said. I absolutely love your videos. Keep up the good work! :D

[jasondeboard]

love your minutephysics.. a big thank you to you and everyone else you work with :)

[NLite]

0:17 love how this graph implies that Henry's garage is farther away than the moon

[Tasarran]

That is true, there is no way to truly represent a 2D object in our 3D framework.
Everything has a thickness, even if its only one atom.

[Xidvad]

I wish my teacher teached the way you do! If you keep this up then I wont have to worry about taking physics next year!

[varunshah]

Comment may seem dumb (I'm not a physicist!) But if we live in a 1-D curve that is all folded up, wouldn't that explain how electrons can 'teleport' between shells, and why things are entangled? (Quantum entanglement! Not your earphones!)

[SparkySywer]

If we lived in a 1d universe, the 1d universe couldn't curl up on itself.

[VaderTheWhite]

This, for some weird reason, made my day. Thank you.

[katew]

One dimension will be the new flat earth.

[smooshymemes]

i would support you, but i have nothing in this world except the ability to comment. keep up the great work!

[Jordatech]

Henry you rock I never thought about space as being describable with one single path.

Sincerely,
--
Jordan D. Ulmer

[reelback]

I have a really scientific question to ask.
How is your garage farther than the moon?

[LuisG]

This channel, Vsauce and Numberphile teach me more than my school. Fascinating.

[KjV]

thanks, Miniutephysics. Your video just blew my mind. Now it's nearly 1 a.m. and I need a new mind gasket. Great >:(

[TheMrFloorball]

if we could define our world a 1D line, we have to pass the following point on the line before reaching another point, we couldn't go directly there