kottke.org posts about water

Navy: using seawater for fuelApr 14 2014

The US Navy is working on technology to convert seawater into fuel to power unmodified combustion engines. They recently tested the fuel (successfully!) in a replica P-51 and hope to make it commerically viable.

Navy researchers at the U.S. Naval Research Laboratory (NRL), Materials Science and Technology Division, demonstrated proof-of-concept of novel NRL technologies developed for the recovery of carbon dioxide (CO2) and hydrogen (H2) from seawater and conversion to a liquid hydrocarbon fuel.

Fueled by a liquid hydrocarbon -- a component of NRL's novel gas-to-liquid (GTL) process that uses CO2 and H2 as feedstock -- the research team demonstrated sustained flight of a radio-controlled (RC) P-51 replica of the legendary Red Tail Squadron, powered by an off-the-shelf (OTS) and unmodified two-stroke internal combustion engine.

Using an innovative and proprietary NRL electrolytic cation exchange module (E-CEM), both dissolved and bound CO2 are removed from seawater at 92 percent efficiency by re-equilibrating carbonate and bicarbonate to CO2 and simultaneously producing H2. The gases are then converted to liquid hydrocarbons by a metal catalyst in a reactor system.

"In close collaboration with the Office of Naval Research P38 Naval Reserve program, NRL has developed a game-changing technology for extracting, simultaneously, CO2 and H2 from seawater," said Dr. Heather Willauer, NRL research chemist. "This is the first time technology of this nature has been demonstrated with the potential for transition, from the laboratory, to full-scale commercial implementation."

Discover has more, in slightly more accessible language.

Why hot water freezes faster than cold waterOct 31 2013

Not to get all Malcolm Gladwell here, but it's counterintuitive that hot water freezes faster than cold water. The phenomenon is called the Mpemba effect and until recently, no one could explain how it works. A group of researchers in Singapore think they've cracked the puzzle.

Now Xi and co say hydrogen bonds also explain the Mpemba effect. Their key idea is that hydrogen bonds bring water molecules into close contact and when this happens the natural repulsion between the molecules causes the covalent O-H bonds to stretch and store energy.

But as the liquid warms up, it forces the hydrogen bonds to stretch and the water molecules sit further apart. This allows the covalent molecules to shrink again and give up their energy. The important point is that this process in which the covalent bonds give up energy is equivalent to cooling.

In fact, the effect is additional to the conventional process of cooling. So warm water ought to cool faster than cold water, they say. And that's exactly what is observed in the Mpemba effect.

(via ★djacobs)

Drinking water from ice coresJan 28 2011

According to climate scientist Paul Mayewski, he and his team sometimes melt down unneeded ice cores that they've collected in places like Antarctica and drink the resulting water. The ice, as well as the air trapped within, can be more than a hundred thousand years old.

Probably the most exciting thing about it is when you have real ice -- that's where the snow has been gradually compacted and eventually formed into ice, and the density has increased. When that happens, if the ice is old, it will often trap air bubbles in it. Those air bubbles can contain carbon dioxide from ten thousand years ago or even a hundred thousand years ago. And when you put an ice cube of that ice in a glass of water, it pops. It has natural effervescence as those gas bubbles escape. You get a little a puff of air into your nostrils if you have your nose over the glass. It's not as though it necessarily smells like anything -- but when you think about the fact that the last time that anything smelled that air was a hundred thousand years ago, that's pretty interesting.

For his wedding reception, Mayewski had water from "Greenland ice and Antarctic ice" for his guests to drink. (thx, finn)

Seawater antennasNov 08 2010

The US Navy is looking for a way to replace bulky antennas on warships with antennas made from seawater.

What they came up with is little more than an electromagnetic ring and a water pump. The ring, called a current probe, creates a magnetic field through which the pump shoots a steam of seawater (the salt is a key ingredient, as the tech relies on the magnetic induction properties of sodium chloride). By controlling the height and width of the, the operator can manipulate the frequency at which the antenna transmits and receives. An 80-foot-high stream can transmit and receive anywhere from 2 to 400 mHz, though much smaller streams can be used for varying other frequencies, ranging from HF through VHF to UHF.

Wow. (via bldgblog)

Bottled hypocrisyApr 29 2010

Things that make it seem like you don't really care about the issue of water management & scarcity at your conference about the future: 1. provide the participants on the water scarcity panel with Fiji bottled water.

Fiji, need we remind you, is an island where water supplies are scarce and locals have struggled to find clean, reliable supplies of drinking water. Meanwhile, Fiji Water owns the rights to the island's largest underground aquifer, drawing water into its diesel-fueled factory and bottling it using heavy-weight plastic. All this makes having Fiji Water at a panel about "the most creative solutions being attempted to meet the water challenge in the United States and around the world" hard to swallow.

Water on the MoonNov 13 2009

NASA announced that it has found pretty hard evidence of significant amounts of water on the Moon.

"We are ecstatic," said Anthony Colaprete, LCROSS project scientist and principal investigator at NASA's Ames Research Center in Moffett Field, Calif. "Multiple lines of evidence show water was present in both the high angle vapor plume and the ejecta curtain created by the LCROSS Centaur impact. The concentration and distribution of water and other substances requires further analysis, but it is safe to say Cabeus holds water."

I don't have to tell you about the implications here. Just think of how much you could sell authentic Moon bottled water for.

Bad company alert: Fiji WaterAug 18 2009

Bottled water is bad but Fiji bottled water is particularly odious. For starters, the country's military regime monitors internet usage at internet cafes in real-time for information about the popular bottled water brand:

I sat down and sent out a few emails -- filling friends in on my visit to the Fiji Water bottling plant, forwarding a story about foreign journalists being kicked off the island. Then my connection died. "It will just be a few minutes," one of the clerks said. Moments later, a pair of police officers walked in. They headed for a woman at another terminal; I turned to my screen to compose a note about how cops were even showing up in the Internet cafes. Then I saw them coming toward me. "We're going to take you in for questioning about the emails you've been writing," they said.

Then the cops threatened the reporter with prison rape. The rest of the story isn't much better.

Update: From Fiji Water's official response to the article:

We strongly disagree with the author's premise that because we are in business in Fiji somehow that legitimizes a military dictatorship.

(thx, mason)

Distinctive watersJun 03 2009

In the future, there will be sommeliers for everything from toothpaste to flip-flops. Today's example: water.

Take Mahalo Deep Sea Water, at £20 for 71cl, which comes from "a freshwater iceberg that melted thousands of years ago and, being of different temperature and salinity to the sea water around it, sank to become a lake at the bottom of the ocean floor. The water has been collected through a 3000ft pipeline off the shores of Hawaii." According to the Daily Mail, Mahalo has a "very rounded quality on the palate" and it "would be good with shellfish."

There's even a book on this "up-and-coming trend": Fine Waters: A Connoisseur's Guide to the World's Most Distinctive Bottled Waters.

Update: The Grand Hyatt Sao Paulo has a cheese sommelier, a specially water menu, and "an extensive soap menu".

Waves in slow motionMay 08 2009

Absolutely gorgeous slow motion HD video of a large wave from under the water...you can clearly see the intricate and powerful architecture of the wave.

Nice surfing shot too...but the wave is mesmerizing.

NYC tap water wins againApr 23 2009

A year ago, I collected a bunch of links related to what makes NYC pizza taste like it does. New York's fantastic tap water was a leading candidate. In a recent blind taste test of identical pies, a panel of judges -- including some noted NYC pizza chefs -- chose a pizza made with NYC municipal water over those made from LA and Chicago water.

Also, I just ran across this map showing NYC pizzerias which are outfitted with coal ovens. There are many more than I would have thought.

The miracle liquidMar 02 2009

Electrolyzed water (salt water that has been run through an electrolytic process) is gaining acceptance in the US as a replacement for many cleaning agents.

At the Sheraton Delfina in Santa Monica, some hotel workers are calling it el liquido milagroso -- the miracle liquid. That's as good a name as any for a substance that scientists say is powerful enough to kill anthrax spores without harming people or the environment.

A food science professor says that electrolyzed water is "10 times more effective than bleach in killing bacteria" and it's safe to drink. (Although maybe it would kill all the bacteria in your stomach?) But beware the phony health claims.

Bottled water considered harmfulOct 20 2008

NY Times editorial: don't bother with bottled water, drink tap instead.

While a lot of bottled water may be as pure as promised in those alluring commercials, the real problem is telling which is which. Public water supplies are regulated by the federal government. Not so for bottled water. The Food and Drug Administration does have some oversight, but bottled water is not very high on their long list of priorities.

Martians have waterAug 01 2008

Water on Mars: confirmed.

Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample. The lander's robotic arm delivered the sample Wednesday to an instrument that identifies vapors produced by the heating of samples.

The lander itself added, on Twitter, "FTW!"

Water in Mercury's atmosphereJul 07 2008

Scientists were recently "astonished" to find water in Mercury's atmosphere. Plus, the particles in the atmosphere were blasted off the surface by the solar wind so the atmospheric water could indicate that it can be found on the surface as well. First Mars and now this. Has The Onion done a "Scientists find evidence of water on Earth" story yet?

Why is New York-style pizza so difficultApr 24 2008

Why is New York-style pizza so difficult to replicate in other areas of the world? Perhaps the answer lies with NYC's legendary tap water.

"Water," Batali says. "Water is huge. It's probably one of California's biggest problems with pizza." Water binds the dough's few ingredients. Nearly every chemical reaction that produces flavor occurs in water, says Chris Loss, a food scientist with the Culinary Institute of America. "So, naturally, the minerals and chemicals in it will affect every aspect of the way something tastes."

Update: That legendary tap water was supposedly responsible for NYC-style bagels as well until Finagle A Bagel founder Larry Smith drove some Boston tap water to NYC and compared bagels made with the water from the two cities.

"There was absolutely no difference between them," Smith reported. "What makes the difference is equipment, process and ingredients."

Well, ingredients except water. (thx, darrin)

Update: Jeffrey Steingarten, among others, believes that temperature is the key to great pizza and that coal is the key to great temperatures. (thx, hillel)

Update: I knew we'd eventually end up on Slice...the web's premiere pizza site hosts an account of Jeff Varasano's attempt to reverse engineer a NYC pizza, specifically from the 117th St. Patsy's. Among his findings:

There are a lot of variables for such a simple food. But these 3 FAR outweigh the others:

1. High Heat
2. Kneading Technique
3. The kind of yeast culture or "starter" used along with proper fermentation technique

All other factors pale in comparison to these 3. I know that people fuss over the brand of flour, the kind of sauce, etc. I discuss all of these things, but if you don't have the 3 fundamentals above handled, you will be limited.

(thx, ian)

Recent research suggests that:Apr 03 2008

Recent research suggests that:

There is no clear evidence of benefit from drinking increased amounts of water.

In particular, scientists found no evidence that the common recommendation of eight 8-oz glasses of water per day has any benefit. NPR busts some additional water myths.

Say this three times fast: sea shrinksMar 25 2008

Say this three times fast: sea shrinks foam cups. (It helps if you sing the words to the tune of Frère Jacques.)

The [styrofoam] cups were then gingerly sent into the deep. During the historic dive, led by Russian scientists, the pressure of the surrounding water crushed the cups to the size of thimbles, also squeezing their whimsies of writing and drawing. Afterward, the tiny cups became instant mementoes of the polar dive, offering striking proof of the descent into an unfamiliar zone and silent testimony to the crushing power of plain old water.

Natalie Angier's short appreciation of water, which,Sep 12 2007

Natalie Angier's short appreciation of water, which, before you scoff, is a pretty amazing substance despite its ubiquity. "Pulled together by hydrogen bonds, water molecules become mature and stable, able to absorb huge amounts of energy before pulling a radical phase shift and changing from ice to liquid or liquid to gas. As a result, water has surprisingly high boiling and freezing points, and a strikingly generous gap between the two. For a substance with only three atoms, and two of them tiny little hydrogens, Dr. Richmond said, you'd expect water to vaporize into a gas at something like minus 90 degrees Fahrenheit, to freeze a mere 40 degrees below its boiling point, and to show scant inclination to linger in a liquid phase."

Compared with Snapple, whiteout, and Pepto Bismol ($123.20/Apr 17 2007

Compared with Snapple, whiteout, and Pepto Bismol ($123.20/gallon), gasoline is surprisingly inexpensive. "$21.19 for WATER - and the buyers don't even know the source. No wonder Evian spelled backwards is Naive."

Update: Rob Cockerham did a more extensive analysis of liquid pricing a few years ago.

Some back-of-the-envelope calculations about the embodied energyApr 17 2007

Some back-of-the-envelope calculations about the embodied energy of bottled water: "the cost to produce and deliver a bottle of imported water is $0.22, leaving $1.28 per bottle profit for the manufacturer and the retail store".

By subjecting ordinary water to extremely highOct 27 2006

By subjecting ordinary water to extremely high pressure and bombarding it with x-rays, scientists at Los Alamos have formed a new hydrogen-oxygen alloy. "Given high enough pressures, even hydrogen will behave as a metal. All the other heavier elements in hydrogen's group of the periodic table are metals."

Bitfall makes images out of falling water droplets. (via infosthetics)Aug 18 2005

Bitfall makes images out of falling water droplets. (via infosthetics)

Hurricane Ivan generated what is thought toAug 05 2005

Hurricane Ivan generated what is thought to be the tallest wave ever observed. The wave was 91 feet high.

Tom Standage says bottled water is "badAug 02 2005

Tom Standage says bottled water is "bad to the last drop". It's more expensive than gasoline, doesn't taste any better, and isn't any safer.

A whole lake of ice has been discovered on MarsJul 29 2005

A whole lake of ice has been discovered on Mars.

Las Vegas is in for some water troublesJul 29 2005

Las Vegas is in for some water troubles. Surprisingly, it's residential use that's the problem, not the showy water displays by the casinos.

Coke is using 500,000 liters of water/dayJul 14 2005

Coke is using 500,000 liters of water/day in India despite water shortages. Coke is threatening to sue a photographer who put up a billboard critical of that water usage.

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