On Sat, 10 Feb 2007 23:32:06 +1100, "Pegasus \(MVP\)" <I.can@fly.com>
wrote:

>
>"Steve Miller" <misterblues39********.com> wrote in message
>news:%23$CeJrQTHHA.1600@TK2MSFTNGP05.phx.gbl...
>> Hello Alias!
>>
>> Thanks for your reply! Why did you remove my signature?
>
>. . . perhaps because Alias felt uncomfortable with your trailer.
>You wrote
>"the volume of the mass of it's particles" but it should really be
>"the volume of the mass of its particles".
>"it's" is a concatenation of "it is":
>"It's hot in here" = "It is hot in here".
>"The dog wags its tail".
>

It's not a concatenation of it is. It's a contraction of it is.
I don't believe there is such a word as concatenation.