oralloy wrote: "Possibly "gold" and "gold reserves" are two different things?"
Yeah, that occurred to me, but here's the original text:
"Very little of it belongs to the U.S. government.
"There are roughly 540,000 gold bars belonging to 48 foreign central banks and 12 international organizations such as The International Monetary Fund or The Bank for International Settlement. The United States has about 5 percent of its gold stored there."
So the context is government gold reserves, and the specific reference is gold belonging to the United States as a federal entity, not to the totality of gold owned by other (private and public) entities within its geographical borders. Besides, I don't see how the latter could be estimated, since gold coins and jewelry can be imported, and the gold content of many items, ranging from computer circuitry to jewelry, containing gold, is not tracked by a central registry.
Incidentally, here's something provocative:
"Former Assistant Treasury Secretary Paul Craig Roberts is making some bold new claims about the Federal Reserve and its official government gold holdings. Dr. Roberts contends, “They don’t have any more gold. That’s why they can only give Germany 5 tons of the 1,500 tons it’s holding. In fact, when Germany asked for this delivery last year, the Fed said no. But it said we will give you back 300 tons . . . . So, they said we will give you back 20% of what you trusted us to keep for you over the next seven years, but they are not even able to do that.” Dr. Roberts goes on to say, “The stocks of gold at the Bank of England seem to be disappearing. The stocks of many of the gold trusts, such as GLD, are being looted . . . all of this gold is disappearing into Asian markets. The entire West is being drained of gold.”
Regarding water, it's essentially incompressible under normal conditions, which is one of several unusual properties it possesses.
I recently read a book by Gerald Pawle called Secret Weapons of World War Two, which deals with British research and development.
One of the programs involved an early robotic drone plane called the Swallow, which was rocket propelled once in flight but launched using a high speed catapult. The catapult trolley carrying the plane was stopped at the end of the track by a hydraulic ram filled with water. It hit the ram with a force of about 80 tons behind it. A cloud of water droplets was expelled like machine gun bullets, riddling the wings with minute holes. They built a steel shield to prevent this, weighing more than 100 pounds and secured by eight heavy bolts, but the force of the water sheered the bolts like putty and blew the shield sky-high.