### Subject: Why isn't mass considered a dimension?

Date: Tue Aug 22 14:36:31 2000
Posted by Gavin Smith
City: Austin State/Province: TX Country: USA
Area of science: Physics
ID: 966969391.Ph
Message:
```
What is the scientific definition of a dimension and what is it that makes
length, width, height, and time dimensions, but not mass?  My perception
of a dimension is that it is a fundamental property by which an object or
event in our universe can be measured.  By fundamental, I mean that it
cannot be expressed as the result of other dimensions (i.e. velocity is
not a dimension because it can be expressed as distance (length, width,
height) divided by time.  If current string theory calls for 10
dimensions, is it not possible that some of these dimensions are already
staring us in the face?  Basically, I'm asking if a dimension is intended
to describe an object's location in the universe (like the 4 spacetime
dimensions we're familiar with) or describe the object itself in the
universe (which could include other fundamental properties as dimensions,
such as mass).

I read through the archives prior to sending this and the questions I am
asking are not specifically addressed.  I would greatly appreciate it if you
would post this for me.

Thanks!

Gavin Smith

```

Response:

```
Re: Why isn't mass considered a dimension?
What is the scientific definition of a dimension and what is it that makes
length, width, height, and time dimensions, but not mass?  My perception
of a dimension is that it is a fundamental property by which an object or
event in our universe can be measured.  By fundamental, I mean that it
cannot be expressed as the result of other dimensions (i.e. velocity is
not a dimension because it can be expressed as distance (length, width,
height) divided by time.  If current string theory calls for 10
dimensions, is it not possible that some of these dimensions are already
staring us in the face?  Basically, I'm asking if a dimension is intended
to describe an object's location in the universe (like the 4 spacetime
dimensions we're familiar with) or describe the object itself in the
universe (which could include other fundamental properties as dimensions,
such as mass).

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Re: Why isn't mass considered a dimension?

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