Lance Michael Farrar
Branch Unspecified
02 Sep 2015

# Question - Mass, Density and Volume

I need some info. A single atom of Carbon has a Mass, Density and Volume at room temperature. How do these change when that Atom is moved to a temperature of -253c. Example; If the Mass, Density and Volume were each arbitrarily given the value of 1 at room temperature - what {if any} would be the % of change when that Atom is moved to -253c?
02 Sep 2015
A single atom does not have a density as defined for bulk matter.

Lance Michael Farrar

Branch Unspecified
02 Sep 2015

Lance Michael Farrar

Branch Unspecified
02 Sep 2015
Does it have Volume and if so does that change?
02 Sep 2015

Lance Michael Farrar

Branch Unspecified
03 Sep 2015
Thank you.

Lance Michael Farrar

Branch Unspecified
03 Sep 2015
A.V.Ramani
This may help:
https://hyperphysics.phy-astr.gsu.edu/hbase/particles/atomsiz.html
Thank you. I didn't see a reference to temperature in the equations. Does that mean that an atom of Carbon has the exact same volume at -253c as it does at room temperature? The reason for asking is that if the volume is lower at -253c then more of them can be held in a smaller space. If they can be contained within that space and brought up to room temperature then the product would have a higher density. Thanks again, Lance
04 Sep 2015
The volumetric coefficient of thermal expansion for diamond is about 0.000003 which means that at -253degC it will contract to (1 - 0.000760) times the volume at 0 degC.

Lance Michael Farrar

Branch Unspecified
04 Sep 2015
It sounds like the volume of a single Carbon atom at room temperature is the same whether it is in the form of a lump of coal or in a Diamond. and it is also the same at -253c.

Lance Michael Farrar

Branch Unspecified
04 Sep 2015
The volume of a single carbon atom is the same whether it is in a Diamond or piece of coal?
04 Sep 2015
Coal is a mix of various things, not just carbon.

This gives specific info on the various carbon allotropes:
https://www.boundless.com/chemistry...-21/carbon-150/allotropes-of-carbon-582-3569/

Lance Michael Farrar

Branch Unspecified
04 Sep 2015