# What is the 4th Dimension - 3D World + Time or 4 Axis?

• nirky
In summary, the conversation revolves around the concept of a 4-dimensional world and its relation to time. While some argue that our world is 3-dimensional with time being the fourth dimension, others believe that the 4th dimension is a new axis. However, when discussing 4-dimensional objects, it refers to their existence in 4 spatial dimensions and one time dimension, with no correlation between the 4th spatial dimension and time. Overall, the main point is the difference between a 4-dimensional world in physics and mathematics.
nirky
Some people say that it's the 3D world we live in + time but others say that it's 4 dimensional as in it as new axis. Which one is true?

russ_watters said:
Time.
So if we talk about 4D solids,does that mean they are related to time...?

No, when we talk about 4D objects, we mean that they exist in 4 spatial dimensions and one time dimension. The 4th spatial dimension has no relation to the time dimension.

Drakkith said:
No, when we talk about 4D objects, we mean that they exist in 4 spatial dimensions and one time dimension. The 4th spatial dimension has no relation to the time dimension.
Thanks Darkkith I understand now.

The main point is whether you are looking at physics (3 space + time) or math (n space, where n is any integer).

## 1. What is the 4th Dimension in terms of a 3D world with time?

The 4th dimension is commonly referred to as time in a 3D world. It is an additional axis that allows us to measure and understand the movement and change of objects in our 3D world.

## 2. How is the 4th dimension different from the other 3 dimensions?

The 4th dimension, time, is different from the other 3 dimensions (length, width, and height) because it is not a physical space that we can see or touch. It is a concept that allows us to understand the progression of events and the movement of objects in our physical world.

## 3. Can we visualize the 4th dimension?

While we cannot directly see or experience the 4th dimension, some scientists and mathematicians have developed ways to represent and visualize it through mathematical models and concepts. However, it is important to note that these visualizations are just representations and may not accurately reflect the true nature of the 4th dimension.

## 4. How does the 4th dimension affect our perception of time?

The 4th dimension, time, plays a crucial role in our perception of time. It allows us to understand and measure the duration of events and the movement of objects in our 3D world. Without time as a dimension, our understanding of the world would be limited and incomplete.

## 5. Are there other dimensions beyond the 4th dimension?

While the concept of dimensions beyond the 4th is a topic of much debate and speculation, there is currently no scientific evidence to support the existence of dimensions beyond the 4th. Some theories, such as string theory, suggest the possibility of multiple dimensions, but they have not been proven or observed yet.

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