Are all materials in 3d why or why not?
No, not all materials can be considered as "3D materials." In the context of your question, the term "3D" refers to three-dimensional, indicating that the material has length, width, and depth.
The distinction here lies in the difference between materials that are inherently three-dimensional and those that have two-dimensional properties or exist in a two-dimensional form.
Many common materials such as solids, liquids, and gases are three-dimensional because they occupy space in three dimensions. For example, a piece of wood, a metal ball, or even a drop of water can be considered three-dimensional materials. These materials have measurable length, width, and depth, making them qualify as three-dimensional.
On the other hand, there are materials that are inherently two-dimensional, meaning they only have length and width but lack depth. A classic example of a two-dimensional material is a sheet of paper. Although the paper has length and width, the thickness of the paper is negligible when compared to the other two dimensions. Similarly, images, text on a page, or paintings on a canvas are considered two-dimensional because they lack depth.
In summary, not all materials are considered three-dimensional. It depends on whether the material possesses length, width, and depth or is inherently two-dimensional with only length and width.