Planck's Constant, h has dimensions Energy second; the Fine Structure Constant, Alpha is dimensionless.
a 3 dimentional one
A paper plate can be one if you flatten it. A sturdy plate is 3-dimentional. A place plate is also 3-dimentional.
A line segment is one dimensional. It only has length.
There are fundamental errors in the question. A particle is three dimentional and cannot exist in a one dimentional universe, nor can velocity.
One other name is "coefficient of variation".
it is a 3 dimentional triangle ... it can be a pyramid with 5 sides ... or one with four sides
1. One dimension array 2. Two dimension array 3. Multi dimentional array
Because that is part of the definition of areas and volumes. You can't have a volume in only one or two dimensions, just as you can't have area in only one dimension. In order to understand that, lets simplify. Area is 2 dimentional, width and height, while volume is 3 dimentional, width, height, and depth.
One is for constant pressure, the other is for constant volume. These are not the same; for example, if the pressure is maintained constant, and the gas is heated, the volume changes.
It helps to think of dimensions as directions of movement. One-dimensional motion, therefore, is motion in a single direction - in other words, just a straight line.
A One dimensional array is one in which a set of values are present in it. Ex: int[] myArray = new int[4]; The above statement creates a one dimensional array that can hold 4 values.
A sphere is a three dimentional shape, a circle is a two dimentional shape. You can't pick up a circle, it can only be drawn. In differential geometry, a one dimensional sphere is a point, a two dimensional sphere is a circle and a three dimensional sphere is what we call a "sphere", there is no limit to the number of dimensions a sphere can have.