Science and myths's video: Is time really an dimension

question that most of us have been asked at some point in our lives, “What’s the shortest distance between two points?” By default, most of us will give the same answer that Archimedes gave more than 2,000 years ago: a straight line. If you take a flat sheet of paper and put two points down on it absolutely anywhere, you can connect those two points with any line, curve, or geometrical path you can imagine. So long as the paper remains flat, uncurved, and unbent in any way, the straight line connecting those two points will be the shortest way to connect them. This is precisely how the three dimensions of space work in our Universe: in flat space, the shortest distance between any two points is a straight line. This is true regardless of how you rotate, orient, or otherwise position those two points. But our Universe isn’t made up merely of three space dimensions, but of four spacetime dimensions. It’s easy to look at that and say, “Oh, well, three of them are space and one of them is time, and that’s where we get spacetime,” and that’s true, but not the full story. After all, the shortest distance between two spacetime events isn’t a straight line any longer. Here’s the science of why.For most of us, our first exposure to the idea of a straight line being the shortest distance between two points comes from a place we might not realize: the Pythagorean theorem. You might remember the Pythagorean theorem as a rule about right triangles, that if you square each of the short sides and add them together, that equals the square of the long side. In math terms, if the short sides are a and b while the long side is c, then the equation relating them is a² + b² = c² In our Universe, of course, we’re not restricted to living on a flat sheet of paper. We have not just length and width (or the x and y directions, if you prefer) dimensions to our Universe, but depth (or the z direction) as well. If you want to figure out what the distance is between any two points in space, it’s the exact same method as it was in two dimensions, except with one extra dimension thrown in. Whatever amount your two points are separated by in the x direction, the y direction, and the z direction, you can figure out the total distance between them just the same as earlier. Only, because of the extra dimension, the distance between them — let’s call it d — is going to be given by d = √(x² + y² + z²). This might look like a scary equation, but it just says that the distance between any two points is defined by the straight line connecting them: the line that accounts for the separation between your two points in all three dimensions: the x-direction, the y-direction, and the z-direction combined. Now, let’s not simply consider space, but time as well. You might think, “Well, if time is just a dimension, too, then the distance between any two points in spacetime will work the same way.” For example, if we represent the time dimension as t, you might think the distance would be the straight line connecting two points through the three spatial dimensions as well as the time dimension. In mathematical terms, you might think that the equation for the separation between any two points would look something like d = √(x² + y² + z² + t²). After all, this is pretty much the same change we made when we went from two dimensions to three dimensions, except this time we’re going from three dimensions to four dimensions. It’s a reasonable step to attempt, and describes exactly what reality would look like if we had four dimensions of space, rather than three. But we don’t have four dimensions of space; we have three dimensions of space and one dimension of time. And despite what your intuition may have told you, time isn’t “just another dimension.” Now to know more watch this full video. Thanks for watching.. Social accounts link Instagram- https://www.instagram.com/scienceandmyths/ Facebook Page- https://www.facebook.com/ScienceAndMyths/ जानिए क्यों समय का भ्रम मानते है वैज्ञानिक Is time really an dimension FAIR-USE COPYRIGHT DISCLAIMER This video is meant for Educational/Inspirational purpose only. We do not own any copyrights, all the rights go to their respective owners. The sole purpose of this video is to inspire, empower and educate the viewers.