Tag Archives: Singapore

WARM OR COLD WATER FREEZES FASTER? ~ DO YOU KNOW?

The following article and responses were posted by George Dvorsky ~ see link at end of blog.

ICEWe may finally know why warm water freezes faster than cool water.

It’s a conundrum that’s baffled scientists since the time of Aristotle: Why do warmer liquids freeze faster than cooler ones? Researchers from Singapore’s Nanyang Technological University have come up with an awesome new theory that may finally put the mystery to rest.

ERASTOIt’s called the Mpemba Effect, and scientists have tossed around a number of theories to explain it.  Some believe that the nucleation temperature of water and the specific impurities it contains determines whether or not the Mpemba Effect will occur. Alternate theories suggest that it may have something to do with certain elements that are in the water, like salt, carbon dioxide, or magnesium. These compounds form a briny muck that causes water to freeze lower and boil higher than it should. And because heating water will shake free some of these substances, the Mpemba Effect can be facilitated.

These aren’t great theories — but they’re the best we got. At least until now.

The Stretching of the Bonds

According to the new study, the Mpemba Effect is caused by a small amount of energy that’s stored in stretched hydrogen bonds.

WATER MOLECULESo here’s the deal: Water molecules have one oxygen atom and two hydrogen atoms, which are held together by covalent bonds — chemical bonds which share a pair of electrons between atoms and a molecule. Then there’s the hydrogen bond to consider; for water molecules, hydrogen atoms are likewise attracted to the oxygen atoms in other nearby water molecules, while water molecules repel each another.

O:H-O bond in water ice. Credit: Xi Zhang et al:WATER ICE BOND

What the researchers discovered was that, as water gets warmer, distance increases between water molecules owing to the repellant force between them. This causes the hydrogen bonds to stretch, and a stretching bond means there’s energy being stored (heating stores energy into the hydrogen bond by shortening and stiffening it) — and this stored energy gets released as the water is cooled, allowing the molecules to get closer to one another. And when molecules get close enough to each other, we get that neat little effect we call cooling, and eventually, freezing.

Now, warm water has more of this hydrogen bond stretching action happening than in cool water. Warm water, therefore, stores more energy — and it has more to release when exposed to freezing temperatures. Which explains why warmer water freezes faster than cooler water.

It sounds like the researchers are really onto something, but it’s just conjecture at this point. Their paper, which appears at the pre-print archive arXiv, still needs to be scrutinized by their peers: “O:H-O Bond Anomalous Relaxation Resolving Mpemba Paradox.”

http://io9.com/we-finally-know-why-warm-water-freezes-faster-than-cool-1458737239

Related link ~ http://io9.com/5505068/decades+long-physics-mystery-sparked-by-ice-cream

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PADDLES UP! EVERYONE – OTTAWA, CANADA DRAGON BOAT FESTIVAL

PADDLES UP FOR THE 2012 TIM HORTONS’

OTTAWA DRAGON BOAT FESTIVAL

The Tim Hortons Ottawa Dragon Boat Festival is the largest festival of its kind in North America. It is a three day event held at Mooney’s Bay Park.

Admission is FREE and features non-stop racing, concerts, children’s area, cultural performances, local delicacies, artisans and fun shopping! It is a great destination in the heart of the Nations Capital and is an easy getaway for visitors from Ontario, Quebec and the United States.

THE 19TH ANNUAL OTTAWA DRAGON BOAT FESTIVAL WILL TAKE PLACE ON JUNE 22-24, 2012

In partnership with the Ottawa Dragon Boat Foundation, paddlers raise funds through the Pledge Challenge for local charities. To join the Pledge Challenge, visit http://www.dragonboatfoundation.net.

The following is a YouTube video of the 2011 Ottawa Dragon Boat Festival –

I just had to include the following inspirational video I found on YouTube, “Must Watch Dragon Boat Clip!!!”, taken from various dragon boat events in Singapore.

This video was created to show that the sport, dragon boating, is not just about training hard to win, but to enjoy and embrace all the elements that it encompasses.

Three fun filled days for everyone – Have a great time – Best of luck to all participants“WINNING PADDLE TAKES ALL!!!”

Rainsoft – Eternally Pure Water Systems, Inc.

SALES & SERVICE for all your water treatment needs in Ottawa and surrounding areas in Ontario and Quebec.

FIRST FRENCH “PEDAL POWERED” SUBMARINE: THREE VIDEOS

This is the first time I’ve tried adding a sound track to my blog and it works – thanks to soundcloud.com!  If you are enjoying the music you might like to read ‘my personal note to all my readers’ at the end of the blog before you watch the amazing videos – enjoy!

PEDAL POWERED SUBMARINE 

The world’s first pedal powered submarine, called, “The Scubster”, has been invented in France by Minh-Lôc Truong and Stéphane Rousson, a team of French designers and engineers.   The sub is powered by connecting a pedal belt to a twin-propeller system that can reach speeds of up to 8 km an hour (5 mph ). The Scubster can reach a depth of 6 meters (20 ft), ideal for peddling through rivers, and shallow ocean excursions.

france, pedal-powered submarine, submarine, yellow submarine, scubster, pedal-powered submarine, french pedal powered submarine, scubster pedal power, scubster french submarine

I have included three videos; “A Scubster Story”;  the under ice testing at Piau-Engaly in the Pyrenees mountains in France; and also one from the 2009 International Submarine Race in Bethesda, Maryland.

     Link to YouTube video, “A Scubster Story” –

      Link to Scubster web site –

http://www.scubster.org/eng-Home.html

      YouTube video of winter testing under ice at Piau-Engaly, France

      Link to YouTube video, 10th Biennial International Submarine Races, 2009 –

Personal note to all my readers –

After checking recent stats on our blog, I am absolutely blown away by the number of readers from around the globe who are sending best wishes and comments (which of course makes my work so much more rewarding).  Countries we’ve heard from so far (all 64 of them!) are listed below.  Rainsoft of Ottawa thanks everyone for your support and for showing your appreciation of my work ‘behind the scenes’. I hope to continue posting intriguing topics that pique your interest, inspirational posts for you to share, environmental concerns that will encourage you seek information from other sources and of course water related posts (conservation, environment, health, sports, marine biology, oceanography, etc.)  It’s also great to ‘tickle your funny bone’ with some of our “Fun Friday” posts from time to time.  Make sure to take time to check through our archives – many informative, enlightening, inspiring  and humourous articles await you…

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