The Shrunken Quarter claim: relationship between mass, volume, density, size?

Factual Questions
1

Edmund Scientific sells science and novelty items. The description of one caught my eye:

[Not Found | - ScientificsOnline.com](Shrunken Quarter)

Specifically this claim about the quarter after it has been shrunken by “high velocity metal forming”:

Maybe I don’t understand scientific uses of these terms, but how is this possible? I could see reducing the volume and retaining the mass by increasing the density. But not this. And what on earth does maintaining the volume “but the size is drastically reduced” mean? Isn’t volume just a more scientific term for size?

And the quarter they show looks like it MUST have less volume.

Is this just advertising claptrap, or am I not getting something technical?

Sailboat

2

So far as I’m aware, size == volume when talking about a 3D object. Reducing size without reducing volume would, thus, be impossible.

3

Either untrue or… are there somewhere side view images? The key might be thickness - if by size they mean only diameter.

4

The shrunken quarter is thicker than usual.
Theory of Operation of the Quarter Shrinker

5

I think the “technical bit” is the fact that the new coin is twice as thick as the old one.

6

this

should be read as

7

A-hah! I was right!

Also, some googling revealed this illustrative picture .

8

Ah, diameter versus “size”. Of course. Thanks!

Sailboat

9

I think this is the link. shrunken quarter

10

I remember reading some copy in a catalog about a titanium hammer. It had “all the mass with half the weight!” :cool: