Unit of Four Dimensional Space Measurement?

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Discussion Overview

The discussion revolves around the measurement of space within four-dimensional objects, specifically seeking to identify the appropriate category or terminology for such measurements. Participants explore theoretical concepts related to higher-dimensional geometry and measurement.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the category of measurement for four-dimensional space, comparing it to one-dimensional distance, two-dimensional area, and three-dimensional volume.
  • Another participant suggests that the four-dimensional measure is known as the "four dimensional Lebesgue measure" or "hypervolume."
  • A different participant agrees with the term "hypervolume" and raises a question about terminology for even higher dimensions, such as 23-dimensional space.
  • One participant notes that the concept of volume can be generalized to higher dimensions similarly to how area extends from length to three-dimensional volume, referencing the applicability of the Pythagorean theorem in multiple dimensions.

Areas of Agreement / Disagreement

Participants express some agreement on the term "hypervolume" for four-dimensional measurements, but there is no consensus on the terminology for higher dimensions or the implications of dimensionality on measurement.

Contextual Notes

There are limitations regarding the definitions of higher-dimensional measures and the implications of different units of measurement in various contexts, which remain unresolved.

Joshuame13
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I have been wondering what type of measurement is used to measure the space inside of a four dimensional (space, not time) object. For example, a one dimensional line's distance gets measured, a two dimensional object's area gets measured, and a three dimensional object's volume gets measured, but what type of unit do four dimensional objects get? I am not looking for a specific measurement, such as inches, liters, or square centimeters. What is the category that four dimensional measurements fall under? I have looked all over the internet, but could not find an answer, so I decided Physics Forums looked like a good place to ask.
 
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Four dimensional Lebesgue measure.

It might also be called hypervolume.
 
Welcome to PF;
I was going to go with "hypervolume".
You got to realize that at some point you will run out of special words for the measure - what if you have 23 space dimensions? Now what do you call it?

Technically the dimensions can have any units though ... so the area of the 2D shape on a v-t graph is a displacement. The meaning of the object, in physics, depends on what it is modelling.
 
the notion of volume generalizes to higher dimensions in exactly the same way that area extends length and 3 dimensional volume extends area.

I found it instructive to realize that the Pythagorean theorem works in three dimensions exactly as in two. The same applies in four or more.
 

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