On Thu, 21 Mar 2013 09:29:07 -0700, mike wrote:

On 3/18/2013 12:54 PM, Bob Engelhardt wrote:
35 lb tungsten "ballast" blocks (race cars): $1877

http://www.stockcarsteel.com/tungsten/

Twice as dense as steel & 50% more than lead, but what a price to pay
for the little space that it saves.
isn't uranium even better? nukes should pay you to haul it away.

No, tungsten is about 3% denser than uranium, and among materials
with similar density, is one of the cheapest and most available.

See http://en.wikipedia.org/wiki/Density#Various_materials :
(Numbers are kg per cubic meter)

Silicon 2,330
Aluminium 2,700
Titanium 4,540
Selenium 4,800
Vanadium 6,100
Antimony 6,690
Zinc 7,000
Chromium 7,200
Manganese 7,325
Tin 7,310
Iron 7,870
Niobium 8,570
Cadmium 8,650
Cobalt 8,900
Nickel 8,900
Copper 8,940
Bismuth 9,750
Molybdenum 10,220
Silver 10,500
Lead 11,340
Thorium 11,700
Rhodium 12,410
Mercury 13,546
Tantalum 16,600
Uranium 18,800
Tungsten 19,300
Gold 19,320
Plutonium 19,840
Platinum 21,450
Iridium 22,420
Osmium 22,570

--
jiw