” Why Aluminium Foil is Shinier on one side …” ?

Why Aluminum Foil is Shinier on One Side Than the Other

aluminum-foilThe most abundant metal in the Earth’s crust, aluminum naturally occurs as a compound with other elements, such as aluminum oxide or potassium aluminum sulfate. As such, it was not isolated as a separate element until 1825 when a Danish chemist, Hans Christian Oersted, was able to produce a small amount.

By 1845, a German chemist, Friedrich Wöhler, had perfected a way of producing enough aluminum to be able to study it. In 1854, the French chemist, Henri Étienne Sainte-Claire Deville improved on Wöhler’s method and developed a process to commercially produce the element, although it still remained expensive, even more than gold.

Other improvements were made independently by chemists Charles Martin Hall (American) and Paul L.T. Héroult (French) in 1886, and by Karl Joseph Bayer (Austrian) in 1888. As a result, sufficiently large quantities of aluminum oxide were now able to be produced from bauxite, and then aluminum could easily be obtained from the aluminum oxide.

This greatly reduced the cost of aluminum, and in 1888, Charles Martin Hall formed the precursor to the Aluminum Company of America (Alcoa), the Pittsburgh Reduction Company. Production methods continued to improve and by 1909, the Pittsburgh company’s output was at 41,000 kg per day. By 1910, the first manufacturing plant for the production of aluminum foil opened in Emmishofen, Switzerland by Dr. Lauber, Neher & Cie.

So why is aluminum foil shiny on one side and not as much on the other? In what is called the Bayer Process, after pure molten aluminum is obtained from aluminum oxide, it is placed in furnaces with a small amount of other elements (typically the final product will be between 99.8% and 99.9% aluminum). This liquid is then poured into “chill casting devices where it cools into large slabs called ‘ingots.’” Next the ingot is treated with heat (annealed), and then rolled between heavy rollers.

This initial foil is sent through still more rollers, several times, until it reaches the desired thinness. For the type of foil that is bright on one side and matte on the other, it is so thin that during some of the last rollings, two sheets of the thin foil must be placed together lest they tear or crimp during the final rolling of the sheets.

One consequence of this is that while the sides that touch the highly polished rollers are burnished to a bright finish, the inner sides that touch the other aluminum foil remain matte.

Bonus Foil Facts:

  • More than just packaging, aluminum can be used to polish silver: after lining a deep pan with foil, cover it with cold water and add a couple of teaspoons of salt and your silverware. Chemistry (magic) will remove the tarnish. A similar process can be used to clean jewelry, except exchange the cold water for hot, and the salt for a tablespoon of laundry detergent. Likewise, a sheet of aluminum foil underneath freshly polished silverware will deter tarnishing.
  • Scissors can be sharpened by cutting through several layers of aluminum foil a few times.

SOURCE::::: Today i found out .com

Natarajan

Image of the Day… ” Young Moon Is Back in the Sky ….” !!!

Young moon returns to the evening sky

Moon was rising and setting with the sun in the past few days. Now it’s far enough from the sun’s glare to be visible in the evening sky, shortly after sunset.

Young moon - a waxing crescent in the west after sunset - captured by Spencer Mann in Davis, California on September 25, 2014.

The young moon is back in the evening sky. We received several photos of it from last night (September 25), and expect to see more photos as the sun sets across the world today. So far the only North American photo we’ve seen came from Spencer Mann in Davis, California. From his location on the western edge of the continent, he managed to catch last night’syoung moon. He wrote:

My aunt Kathy Friebertshauser and I camped out on a country road, waiting to see the waxing crescent. We weren’t disappointed – it was very faint, but clearly visible among the dark clouds, rose-tinged sky, and coastal mountains. It was definitely a scene worth waiting for!

Denis Crute in Parkes Australia had a better view of the moon than we do in North America. At this time of year (spring in the Southern Hemisphere), it’s possible to catch objects in the western twilight above the sunset, not to one side of the sunset as we now see it during our northern autumn. Here’s Denis’ photo, taken a few hours after Spencer caught his, as night fell in Australia on September 26.

Denis Crute had a better view of the moon from Parkes, Australia.  Here it is on the Australian evening of September 26.  Thank you, Denis!

Will you see the moon near Mercury on the evening of September 26? Maybe.

This little moon will be waxing in the evening sky over the next couple of weeks. It’s waxing toward a full moon eclipse, visible in North America, on the night of October 7-8.

 

SOURCE::::Earth sky news

Natarajan

Joke of the Day… ” Key in the car … ” !!!

Bill, Jim, and Scott were at a convention together and were sharing a large suite on the top of a 75-story skyscraper. After a long day of meetings they were shocked to hear that the elevators in their hotel were broken and they would have to climb 75 flights of stairs to get to their room. Bill said to Jim and Scott, let’s break the monotony of this unpleasant task by concentrating on something interesting. I’ll tell jokes for 25 flights, and Jim can sing songs for 25 flights, and Scott can tell sad stories the rest of the way. At the 26th floor Bill stopped telling jokes and Jim began to sing. At the 51st floor Jim stopped singing and Scott began to tell sad stories. “I will tell my saddest story first,” he said. “I left the room key in the car!”  

SOURCE::::joke a day.com

Natarajan

The Most Entertaining Airports In The World …

Here are seven international airports that go beyond free Wi-Fi and luggage carts to offer truly entertaining amenities.

Amsterdam Airport Schiphol, Haarlemmermeer, Netherlands

Amsterdam Airport SchipholFlickr/ajay_suresh

Amsterdam Schiphol Airport highlights: “Holland Boulevard,” a library, Dutch Kitchen restaurant, a museum, and Holland CASINO.

Changi International Airport, Changi, Singapore

changi slideFlickr/wongjunhao

Changi International Airport highlights: Nature trails, gardens, a four-story slide, a rooftop pool, and a movie theater (free admission).

Munich Airport, Munich, Germany

Munich AirportMunich Airport

Munich Airport highlights: Airbrau brewery and restaurant, free surfing lessons in the outdoor wave pool (summer only), volleyball tournaments, and a Christmas MARKET.

Incheon International Airport, Incheon, South Korea

incheon airportFlickr/zionorbi

Incheon International Airport highlights: “Spa on Air” sauna, Thai massage, the Ice Forest skating rink, a movie theater, gardens, and traditional musical performances.

Hong Kong International Airport, Chek Lap Kok, Hong Kong

Hong Kong International AirportHong Kong International Airport

Hong Kong International Airport highlights: A nine-hole golf course, the Aviation Discovery Center, the Dream Come True Education Park, and an IMAX theater.

Vancouver International Airport, Richmond, British Columbia

vancouver airportFlickr/alanchan

Vancouver International Airport highlights: A 114,000-liter aquarium and a jellyfish exhibit.

Zurich Airport, Zurich, Switzerland

zurich airportFlickr/patrick_nouhailler

Zurich Airport highlights: Observation decks and a miniature airport for children.

This article originally appeared at SmarterTravel.

SOURCE::: Business insider.com

Natarajan

Read more: http://www.smartertravel.com/photo-galleries/editorial/the-worlds-seven-most-entertaining-airports.html#ixzz3ENucJlFf

Message For the Day…”Train Your Sense Organs Only to Perceive Sacred Things…”

In the drama of life, some act on the basis that nothing belongs to them and that, whatever words one utters or whatever action one does, all belong to God and nothing is their own. They play their role in this spirit, ascribing nothing to oneself. The other category are those that are like the actors who are conscious of the role they are playing and do not forget their individuality in their actions. They do not consider themselves as merely acting a part but as the doer. The difference between the two is that while the former realises the temporary nature of the part being played and is not attached to the things connected with the role, the other develops attachment to the role and does not wish to part with things connected with the role. Presently, most people suffer from the possessive attitude. The reason is the failure to use the senses properly and enslavement to the desires prompted by them. Train your sense organs only to perceive sacred things and abstain from indiscriminate enjoyment.

Sathya Sai Baba

Image of the Day…Pic. That Spoke 1000 Words !!!

India’s Mars mission: Picture that spoke 1,000 words

Indian staff from the Indian Space Research Organisation (ISRO) celebrate after the Mars Orbiter Spacecraft (MoM) successfully entered the Mars orbit

Related Stories

When the crowded command control room of India’s Mars mission exploded into applause after it successfully put a satellite into orbit around the Red Planet, photographer Manjunath Kiran of the AFP news agency clicked this remarkable image of scientists congratulating each other.

Wednesday’s picture arrived with a rather anodyne caption saying “staff from the Indian Space Research Organisation (Isro) celebrate after the Mars Orbiter Spacecraft (Mom) successfully entered the Mars orbit”.

But in reality, the picture was about much more than that – a bunch of smiling Indian women resplendent in gorgeous saris greeting each other as their male colleagues look on admiringly at mission control in Bangalore.

“The women were leading the applause when the good news arrived. They were celebrating more than men. Who said men are from Mars and women are from Venus?” says senior science journalist Pallava Bagla, who was present in the control room.

The picture – which brightened up my manic morning writing up the Mars mission story – went viral and became the event’s image of the day.

People in their thousands tweeted that they loved it. One said “when was the last time you saw women scientists celebrate a space mission?”; another that the women showed “we don’t need to wear labcoats”. Others said the scientists in saris had “redefined mission control” and called them “true role models”.

The chatter even veered into the contentious Indian debate about tradition and modernity.

Look at our rocket scientists, said one tweet, when women working in call centres think that wearing jeans “makes them modern and scientific”. Somebody wondered why “no matter how much women succeed/achieve, the focus ultimately is on what they are wearing?” That, another respondent tweeted, is “because we have newspapers telling us that smart career women don’t wear saris only western business suits!”.

Although we do not know for sure whether all the women in this picture are engineers or scientists, they all probably work with India’s space agency. Some 20% of Isro’s 14,246 employees are women and their numbers are growing.

Nandini Harinath, 44, a physicist and a mother of two, was the deputy operations director of the Mars mission – in other words, she was the person “operating” the spacecraft between Earth and Mars. “It’s easier to bring up children than to control the Mars orbiter,” she told the NDTV news channel. Minal Sampath and her team built three instruments for the spacecraft and she wants to become “the first woman director of a space centre”.

A woman leads one of the agency’s main strategic programmes. Another female engineer was in charge of wheeling out the 15-storey-high 320,000kg (320 tonne) Satellite Launch Vehicle (SLV) from the vehicle assembly building to the launch pad. Tessy Thomas, a scientist from India’s Defence Research and Development Organisation (DRDO), is thought to be one of the very few women working on strategic nuclear ballistic missiles in the world. Three women led a team which launched a communication satellite three years ago.

What next? Will a woman head India’s space agency one day? (All seven chairmen of Isro so far have been men.) And, as Pallava Bagla writes, Isro reckons that the first astronaut from India “could well be a woman”. When that happens, Indian women will be over the moon.

SOURCE:::: Soutik BiswasDelhi correspondent IN BBC.COM

Natarajan

” ஒரு தேசத்தின் பெரும் பாய்ச்சல்…” !!!

நிலவில் கால்வைத்தவுடன் நீல் ஆம்ஸ்ட்ராங் சொன்ன வாசகங்கள் இவை: ‘‘ஒரு மனிதனைப் பொறுத்தவரை சிறிய காலடிதான் இது. ஆனால், மனித குலத்தைப் பொறுத்தவரை பெரும் பாய்ச்சல்.” இந்தியாவின் மங்கள்யான் செவ்வாயை எட்டிப்பிடித்திருக்கும் தருணத்திலும் ஆம்ஸ்ட்ராங்கின் வாசகங்கள் மிகவும் பொருத்தமாக இருக்கின்றன. ஆம், நம் தேசத்தைப் பொறுத்தவரை பெரும் பாய்ச்சல்தான் இது.

இந்தியாவிலேயே தயாரான கருவிகள், பொருட்கள் போன்றவற்றைக் கொண்டு உருவாக்கப்பட்ட தொழில்நுட்பத்தின் சாதனை இது. மிக முக்கியமாக, இந்திய அறிவால் உருவான தொழில்நுட்பத்தின் பெரும் சாதனை என்றுதான் சொல்ல வேண்டும். இரண்டாம் உலகப் போருக்குப் பிறகு, சோவியத் ஒன்றியமும் அமெரிக்காவும் விண்வெளிப் போட்டியில் தீவிரமாக ஈடுபட்டதன் விளைவாக, நவீன வானியல் யுகம் அதிநவீன வானியல் யுகத்துக்கு வித்திட்டது. இந்தியாவுக்கோ, சுதந்திரம் அடைந்த பின் எல்லாவற்றையும் முதலிலிருந்து ஆரம்பிக்க வேண்டிய சூழல். எனவே, வளர்ந்த நாடுகள் ஏற்கெனவே ஓடிக்கொண்டிருந்த இந்த ஓட்டப் பந்தயத்தில் இந்தியா சற்றுத் தாமதமாகக் கலந்துகொண்டது.

எனினும், இன்று மங்கள்யான் வெற்றியின் மூலம் இந்தியா வானியல் பந்தயத்தின் முதல் இடங்களில் வந்துகொண்டிருப்பதைப் பார்க்கும்போது, அசாதாரணமான சாதனை இது என்றே சொல்லத் தோன்றுகிறது. உலகின் எந்த நாடும் முதல் முயற்சியிலேயே இதைச் சாதித்ததில்லை என்பது இந்தச் சாதனையை மேலும் உயர்த்தியிருக்கிறது. இதைச் சாத்தியமாக்கியிருக்கும் இஸ்ரோ விஞ்ஞானிகளுக்கும் அவர்களின் முன்னோடிகளுக்கும், மங்கள்யான் திட்டத்துக்கு ஒத்துழைப்பு நல்கிய ஆட்சியாளர்கள், அதிகாரிகள் அனைவருக்கும் வாழ்த்துக்களையும் நன்றியையும் இந்தத் தருணத்தில் நாம் உரித்தாக்குகிறோம்!

எந்த தேசத்துக்கும் இளைத்ததல்ல இந்தியா என்ற உண்மையை உரக்கச் சொல்லியிருக்கும் மங்கள்யான் வெற்றியை அனைவரும் கொண்டாடுவோம்!

புகைப்படங்கள் – தி இந்து ஆவணக் காப்பகம்

MARS MAVEN OF NASA….

Mars MAVEN spacecraft’s first observations

MAVEN is the first spacecraft dedicated to exploring the tenuous upper atmosphere of Mars. It entered orbit around Mars on September 21, 2014.

MAVEN is the first spacecraft dedicated to exploring the tenuous upper atmosphere of Mars.  It entered orbit around Mars on September 22, 2014.  This composite image represents the first observations returned from the craft.  Image via NASA

NASA said yesterday (September 24, 2014) that MAVEN – aka the Mars Atmosphere and Volatile Evolution spacecraft – has now obtained its first observations of the extended upper atmosphere surrounding our neighboring planet Mars.

MAVEN is the first spacecraft dedicated to exploring the tenuous upper atmosphere of Mars. Its Imaging Ultraviolet Spectrograph (IUVS) instrument obtained these false-color images eight hours after the successful completion of Mars orbit insertion by the spacecraft at 10:24 p.m. EDT Sunday, September 21, after a 10-month journey.

The image shows the planet from an altitude of 36,500 km in three ultraviolet wavelength bands. Blue shows the ultraviolet light from the sun scattered from atomic hydrogen gas in an extended cloud that goes to thousands of kilometers above the planet’s surface. Green shows a different wavelength of ultraviolet light that is primarily sunlight reflected off of atomic oxygen, showing the smaller oxygen cloud. Red shows ultraviolet sunlight reflected from the planet’s surface; the bright spot in the lower right is light reflected either from polar ice or clouds.

The oxygen gas is held close to the planet by Mars’ gravity, while lighter hydrogen gas is present to higher altitudes and extends past the edges of the image. These gases derive from the breakdown of water and carbon dioxide in Mars’ atmosphere. Over the course of its one-Earth-year primary science mission, MAVEN observations like these will be used to determine the loss rate of hydrogen and oxygen from the Martian atmosphere. These observations will allow us to determine the amount of water that has escaped from the planet over time.

Bottom line: First observations from the Mars MAVEN spacecraft, which is dedicated to exploring Mars’ tenuous upper atmosphere.

Via NASA

SOURCE:::: earth sky news

Natarajan

மங்கள்யான் அனுப்பிய முதல் புகைப்படம்… !!!

செவ்வாய் கிரகத்தை ஆராய அனுப்பப்பட்ட மங்கள்யான் விண்கலம் எடுத்த முதல் புகைப்படத்தை இஸ்ரோ வெளியிட்டுள்ளது.

இஸ்ரோவின் செவ்வாய் கிரக ஆராய்ச்சி மிஷனின் அதிகாரப்பூர்வ ஃபேஸ்புக் பக்கத்தில் ( ISRO’s Mars Orbiter Mission) முதல் புகைப்படம் வெளியிடப்பட்டுள்ளது.

மங்கள்யான் விண்கலம், அதில் பொருத்தப்பட்ட வண்ணப் புகைப்பட கேமராவை பயன்படுத்தி எடுக்கப்பட்ட 10 புகைப்படங்களை வியாழக்கிழமை காலை அனுப்பியுள்ளது. செவ்வாய்கிரகத்தின் மேற்பரப்பை படம் எடுத்துள்ளது.

இந்தப் புகைப்படங்கள் முதலில் பிரதமர் பார்வைக்கு அனுப்பிவைக்கப்பட்டன. அதனைத் தொடர்ந்து இஸ்ரோவின் மார்ஸ் மிஷன் ஃபேஸ்புக் பக்கத்தில் பகிர்ந்து கொள்ளப்பட்டுள்ளது.

புதன்கிழமை காலை மங்கள்யான் விண்கலம் செவ்வாய் சுற்றுவட்டப் பாதையில் வெற்றிகரமாக நிலைநிறுத்தப்பட்டது. விண்கலம், சுற்றுவட்டப் பாதையில் நிலைநிறுத்தப்பட்ட சில மணி நேரங்களில் விண்கலத்தில் இருந்தவற்றில் 5 உபகரணங்கள் இயக்கப்பட்டன.

அதில் ஒன்று வண்ணப் புகைப்பட கேமராவாகும். அந்த கேமரா செயல்படத் தொடங்கி, 10 புகைப்படங்களை அனுப்பியுள்ளது. மற்ற இயந்திரங்களும், ஒன்றன்பின் ஒன்றாக செயல்படத் துவங்கும் என இஸ்ரோ விஞ்ஞானிகள் தெரிவித்துள்ளனர்.

Source::::the hindu..tamil
Natarajan

5 Surprising Things That Cost More Than India’s Historic Mission To Mars !!!

India just became Asia’s first interplanetary power. The country’s Mangalyaan satellite successfully made it into orbit around Mars on Wednesday after a roughly 10-month journey. The mission comes at an astonishingly low cost of $74 million, or nearly one-tenth of the price of NASA’s MAVEN spacecraft that entered the red planet’s orbit Sunday night.

Indian Space Research Organization chief K. Radhakrishnan even called the Mars Orbiter Mission “the cheapest interplanetary mission ever to be undertaken by the world.”

Just how cheap? This graph shows a handful of surprising things that cost more than India’s Mars mission.

India Mars

Business Insider

  • The most expensive apartment ever sold in London had a price tag of $237 million. You could get three of India’s satellites for that cost, and with a better view.
  • The new F-35 fighter jet costs a jaw-dropping $160 million a pop.
  • “Gravity” starring George Clooney and Sandra Bullock cost about $100 million. That’s about one-third more than the cost of the successful Mars mission.
  • The Airbus A380 would set you back more than $400 million. You could get more than five Mangalyaan satellites for that price.

 

SOURCE:::: Mike Bird  in Business Insider India.com

NATARAJAN