4th Dimension Explained By A High-School Student

imagine that this folder is a dimensional plane now assuming that is no height and no depth what would this mean it would mean that it's a one-dimensional world so if hypothetically an organism was living inside of it it would only be able to move in a linear path forward and backwards in a straight line now if we go to the second dimension we have two dimensions we have width and we have length so hypothetically if an organism lived inside of here then it would be able to move up down left right than anywhere else in between and a two dimensional world is comprised of an infinite series of one dimensional worlds stacked upon each other just as our three-dimensional world which has depth and length and height is comprised of an infinite series of two dimensional worlds so this now that I have stamped many folders upon each other we have three dimensions we have depth we have length and we have width now what happens if you keep going on from here on and we would have a four dimensional world what exactly is a fourth dimension in order to understand this we need to understand how two mentions are perceived we live in the three-dimensional world but despite that we actually view things it to be two dimensionally take a perfect sphere for example if you're looking at sphere it looks just like a regular two-dimensional circle the only way that you could tell it's a sexual sphere instead of a circle is because of the hues of light down so just like in a two-dimensional world if a organism in the two-dimensional world was looking upon circle but the light would make it appear to be lighter at one end and darker at the middle also if you if an object is moving farther closer and farther away from you you don't actually perceive that it's getting closer and farther away you see that it's beginning smaller or larger and then you assume that it's getting either farther away or closer but but say that object was to grow and perfectly equilibrium so that it was growing at the same speed that it was shrinking as you move it farther away that me would not be able to tell without any lights or if there were details on the object that it's moving or growing at all it may have assumed that since we perceived things to be in two dimensions that a two-dimensional organism would see in one dimension so as we're watching this rubber brand expand as it moves farther away from this little organism in the two-dimensional world it's does not actually perceive anything that's happening to it because it's growing at the same speed that is moving farther away but since we can actually see it from the three-dimensional world and perceive things to be in two dimensions we can see things for how they actually are the reason that the two dimension organism doesn't see things the way they really are is because the two-dimensional organism sees things in one dimension just how we three-dimensional creatures see things in two dimensions so in a way we don't really see our world the way it truly is a four dimensional creature I've ever seen our three-dimensional world in three dimensions would be able to see through things to be able to see absolutely everything just as we could see if there was several organisms spread along a 2d environment on your floor you'd be able to see inside houses you would be able to see inside of people so if a two-dimensional world a flat surface has just made of an infinite amount of lines then the 3d world is just made out of an infinite amount of planes so the forty world logically is made out of an infinite amount of 3d objects though they're not just put together like um you would like building blocks it's that's not how the 4d world is that just be 3d again so in order to understand this we need to understand the logical progression of mathematics in our world imagine that this connects piece represents the first dimension it's simply a straight line which is basically what the first dimension looks like and if you add three more of these straight lines and connect them to do so that adjacent sides are perpendicular and opposite sides our parent law then you have the basic shape of the second dimension you have a square now if you keep going from here and you add full hand it so that there's a total of four squares and all adjacent sides are perpendicular and all opposite sides are parallel then you end up with obviously a cube so if you're trying to keep going from here and you would have a four dimensional basic shape you would have eight what's called a tesseract now I cannot show you a tesseract but you need to understand that it's basically four cubes that are within each other that have all adjacent sides perpendicular and all pair and all opposite sides parallel yet there are three lines connect four lines connect into each vertex so a tesseract would look somewhat like this picture now that that's not exactly what it looks like because this is a two-dimensional depiction and obviously not all the lines are straight so I cannot show you what assessor Act actually looks like because we cannot perceive things in the third dimension you cannot even imagine what the tesseract looks like you cannot physically it you cannot in your mind picture the fourth of nitrogen or a fourth dimensional shape and you can keep going on from the fourth dimension even you can go to the fifth dimension the sixth dimension the seventy first dimension it doesn't matter theoretically there are an infinite amount of spatial dimensions a common misconception of the fourth dimension is that the fourth dimension is time now while some argue that goodbye going forward and backwards in time if you move forward the same distance and backwards the same then you would end up in the same place you started just like in the fourth dimension and while that may seem logical if you think about it really doesn't make sense if you imply that the fourth dimension is actually time well first of all time is not spatial there's a difference between space and time quite obviously and assuming that all dimensions are according to a pattern then that doesn't really make sense either because saying the 4th dimension is time every dimension has time in it so that would mean that the 4th dimension is special in some way which doesn't really make any sense another reason this doesn't make sense is that we so very very very slightly travel through time whenever we move due to the distance that light takes to get to our body if a group of astronauts were to get in a spaceship and they are to go very very very close to the speed of light then they would and they they went around in this how impossible nearly the speed of light spaceship for a few months and then afterwards they returned earth they would find that earth had actually progressed a few years so they had moved forward in time I move in that quickly another interesting concept involved in the 4th dimension is there many physicists and even mathematicians may say that the dimensions are very very slightly curved because if you really think about it nothing can be truly absolutely infinite so imagine that a the first dimension the line is just very very slightly curved so that after a very long time it will end up creating a circle so as suggested by many physicists if you keep going in the same direction then you will end up where you are where you started after a very very long amount of time obviously and the same thing would happen to the second dimension if it's just a square and then you extend it very very slight leave and a curve and it will eventually make a sphere and the same thing happens in our dimension except it will form a very very slightly curved third dimension which will form a four dimensional universe basically so what this kind of means is that our 3-dimensional world is within a four dimensional world and the four dimensional worlds within the fifth dimensional world and so on now I did say that nothing can be truly infinite but if this is true and a dimension is really within another dimension within another dimension within another dimension then I'm implying that there an infinite amount of dimensions which is the only problem I really have with the seer I'm not sure if it ever stops or if infinite infinity is really even possible we don't know that thanks for watching my video and I hope this gave you a better idea of what the fourth dimension is

Channel: xkcdHatGuy

Views: 12,662,893

Rating: 4.8496327 out of 5

Keywords: 4th, dimension, dimensions, Flatlands, space, time, science, Edwin, Abbott, math, mathematics, physics, geometry, theory, quantum, Euclidean, pancakes, philosophy, fourth, light, travel, mystery, dynamics, xkcdhatguy, xkcd, watts, sagan, Four-dimensional Space

Id: eGguwYPC32I

Length: 9min 4sec (544 seconds)

Published: Tue Jan 05 2010