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To eleborate on the previous answer there are at least 10 spacial dimensions and 1 dimension of time. There appears to be some truth behind string theory with respect to the quantum world, explanation and visualization follows. Take a box, the box represents the 3 spacial dimensions that we know; width, heigth and depth. Now take any top corner of the box and go to any other corner. You will see you can do this 7 times. Now rather that imagining a straight line between each of those corners, imagine them folded onto themselves. This appears impossible because we are big and can only see 3 dimensions and we can perceive time. But the quantum particles see 7 dimensions of space clearly and our 3 dimensions less clearly. To illustrate this, you are a quantum particle stopped at the road in outter space. You see 7 major highways, and you can barely see 3 trails (our 3D space). You will take one of the highways, but whilest you are on one of the 7 spacial dimensions, you will still be within 3D space (as if you saw and took a shortcut) which the macro i.e., atoms cannot see or do. Technically within 4D space (3D + Time). So a quantum particle is at all times in 5 dimensions whereas we are in 4 dimensions. This is why quantum appears random from 3D analysis because they are always moving on 5 planes.
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Does fourth dimension really exist?
Yes. The 4th dimension is time. According to String Theory (which is unverified), there may be as many as 11 dimensions, but dimensions above the fourth are hypothetical.
How many dimensions in a cone?
A cone needs a three dimensional space in which to exist but it's not a solid, it's a two dimensional surface.
How many dimensions does a solid body have?
It has three dimensions.
How many dimensions there are?
Depends what you mean by "dimension", since there are several definitions of the word. In mathematics, there are an infinite number of dimensions, since (for the most part, except in geometry) dimension simply refers to an array of numbers or co-ordinates. It is therefore possible to construct a graph (or build a co-ordinate system) with any number of "dimensions". Many branches of mathematics deal with these higher co-ordinate structures. In geometry, dimension has a similar definition to the physical sense, but again an infinite number of dimensions are available, since these do not necessarily refer to "real world" applications. Euclidean geometry deals with 2-dimensional spaces, while non-Euclidean geometries deal with 3, 4 or more "dimensions" of object.In physics (the sense I think you mean) the question is still somewhat open. Originally we believed there were only three, but Einstein demonstrated that time was another dimension, and thus established that there were four (three spatial and one time). Recently, certain problems in physics have suggested that even "higher" dimensions exist. These dimensions are purely (as far as we know) spatial, but are "wrapped up" tightly around themselves, and are thus invisible and undetectable in most situations.Depending on which theory you go for, there could be five, eight, or even eleven dimensions out there. The current strongest candidate (but far from proven yet) is M-Theory, which holds that there are 11 spatial dimensions, wrapped up into what are called Calabi-Yau manifolds, like little knots at every point in space-time.These dimensions will never be "viewed" by human eyes, even if proven or otherwise detected, since our entire sensory system is built around 3 perceivable spatial dimensions, and thus we would have no frame of reference to understand what we would be seeing.We operate in three dimensions, plus time. That's four. But there can be more. In mathematics, any number of dimensions can be managed (or attempted, at least). Theoretical physicists are currently working with a dozen or so in what are called manifolds in an attempt to understand reality as we know it. The number of dimensions will vary as the individual who is manipulating them or working in them. Usually the x, y, z axes and time are sufficient for most of us.This is an interesting question in contemporary physics. Albert Einstein described the universe as existing in 4 dimensional space-time, but M-theory (an extension of string theory) postulates that there are 11 space-time dimensions.(P.S. How many dimensions are there?)One. Unless in the future humans create a device which can create others.
How many dimensions a rectangle have?
It has 2 dimensions which are length and width
