Run a car on hydrogen and pure water drips out the tail pipe.
One plus is that, apart from the possibly dirty business of generating it, the gas is the cleanest fuel on the planet, combining with oxygen to create H2O, pure water vapor.
The following Monday, in a separate test, Edwin and I put roses, given to us in celebration of the Forbes Billionaires launch, into three mixtures: pure water, water laced with scotch remnants, and a combination of water and Pomegrante Acai Frava.
Slingshot is a vapor-compression water-purification machine that can produce about 30 liters of 100% pure distilled water per hour using the same power as a hair dryer consumes.
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In absorption mode, the cloth can hold 340 percent of its own weight -- compared to just 18 percent without the polymer's aid -- and when it warms up, it releases the collected moisture as clean and pure potable water.
Made from personally selected blue agave plants, multiple distilled with pure spring water, it gets its platinum color from ultra-modern filtration, and is finished by hand with an extra anejo tequila which has rested in oak barrels for five years to enhance the flavor.
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With an edge of sweetness, it tastes of ripe malted barley, and is made with water so pure it shines.
Colloidal silver is a solution of submicroscopic particles of pure silver suspended in water by an electric charge on each particle.
Economists would generally argue that price is the right way (although with caveats, pure price allocation of drinking water in a drought might raise hackles) to do that rationing.
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"Every child deserves to grow up with water that is pure to drink, lakes that are safe for swimming, rivers that are teeming with fish, " President Bill Clinton has said.
What happened to the poisoned water from all those pure wells?
"We have found a habitable environment which is so benign and supportive of life that if you had been on the planet, the water would have been pure enough to drink, " said planetary scientist John Grotzinger, at the California Institute of Technology, who is the mission's project scientist.
If you oxidize any hydrocarbon, you generally produce heat, carbon dioxide, and water vapor, assuming a relatively pure fuel source.
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What brings me back is a collection of specifically New England sensations that I associate with the place: free-wheeling a bicycle down a sandy beach road, the tang of lemon on fried clams, the clear green water of the north Atlantic and the pure maritime light.
Piping hot water is siphoned off to public pools, where the water is minimally treated to keep it as pure as possible.
The food is remarkable: pure, elemental, and as clean-tasting as the water sparkling outside.
Instead, it points the finger squarely at the industry's sub-par standards testing, claiming the procedures for IPX5, IPX6 and IPX7 require the use of pure, room temperature H2O, not the warm, soapy water involved in everyday hygiene.
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They fill the container with pure air made by evaporating liquid nitrogen and liquid oxygen, and add water vapour and some trace gases.
Both devices combine top-notch specs with beautiful industrial design -- pure rectangular forms with a mirror-like finish packaged in thin, light and water-resistant shells.
Nestle, the Swiss company that makes Poland Spring, Nestle Pure Life, Deer Park and other brands, has nearly half of the share of the bottled water market.
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