Question about density

[Winston Blake]

My guess is that this guy thinks Density = Weight / Volume, and hence that putting an object in stronger gravity will make it 'denser'.

[Sriad]

Somewhat of a hijack, but I think related. Since specific volume is the reciprocal of density, why is it not constant too? (i'm in thermodynamics now)

It is a constant. Because specific volume is for a single unit of mass., the density and mass are always the same so the specific volume is too (assuming you use the same unit of mass as a point of reference).

Here's where I am confused: specific volume varies with temperature and pressure, while density does not. There's a whole table at the end of my thermodynamics book that proves this.

Yea, like TBC said, this thread is basically railing a guy for thinking density can change without changing mass or volume. There are lots of ways to change density (many mentioned through the thread), but all of them involve one or the other.

My guess is that this guy thinks Density = Weight / Volume, and hence that putting an object in stronger gravity will make it 'denser'.

I hope so, because instead of being god damn stupid, he'd just be mistaken.