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A traditional technique of cleaning food burnt vessels and the Physics behind it

I now stay alone doing the cooking and washing all alone. In between cooking also I manage to watch a bit of TV, browse net, respond to WhatsApp and FB etc. Most of the time, I successfully manage alll these without any mishaps. A few days back it so happened that I kept milk for boiling in a steel sauce pan on the induction cooker. A WhatsApp chat engaged me so much  that after some time I smelt a burning of vesselt. When I looked, I was shocked to see that the entire milk was boiled and finished and the vessel was all burnt dark like charcoal. I tried to add gel cleaner and scrubber and even after two days most of the charcoal like appearence of the vessel remained and I thought that the vessel may not be put to use anymore.

Suddenly there was a flashing memory, my grandmother seemed to tell, “put some raw rice and water in the vessel, keep for some time and scrub.” Suddenly I decided to try this. A handful of raw rice was put into the burnt vessel and some water was also added. I kept it for about half an hour and then started scrubbing. To my astonishment, the charcoal like coating which I had on the steel vessel, which I thought I will never be able to remove, started to come ouot now. Within a few minutes of rubbuing most of the burnt coating was removed. I was really happy and at the same time felt apprecoative of the ancient techniques of cleaning. In ancient times, when they didn’t have LPG or induction cooker, cooking was mainly by burning wood and getting a  cot of carbon over the vessel was common. But every day the vessels were cleaned like sparkling new except the bottom part which is intentionally left black and rough to enable maximum absorption of heat from the source during cooking. The black colour has the piorpert5y of absorbing all the heat radiations incident on it.

Various techniques are used at that time depending on the type of burn or the type of dirt.

For example, If a copper vessel is having black patches, we use tamarind and coconut fibres along with some clean sand. The tamarind reacts with copper oxide and loosens it, the fibre provides a smooth hold and contains the tamarind and sand. The sand which is silica, is hard and acts as the sdcrubbing particles releasing the copper oxide from metal surface. Thus in a few minutes, the copper vessel will shine like new, which is also the result of the lustre of metal. (shining of a freshly cut metal surface. The scrubbing takes away a thin layer of the dim oxidised surfaces and makes it shiny)

Let’s come back to my case, the action of raw rice. Just like the example of cleaning copper vessel, here the rice provides some chemical reaction with the burnt mik and carbon. When the burnt vesssel is allowed to stand for a while with water and rice, the rice gets softened and the rice husk remains get released. The soaked rice reacts with the burnt milk and loosens it. Now after about half an hour when we start scrubbing, the nanosized rice husk particles which are  hard like silicate helps in removing the loosened burnt milk.

This action of the hard and smooth nano particles along with the chemical reaction of rice with the burnt milk help to clean the vessel easily.

Divyang Bhavani accepts the challenge and takes Board Exam – An inspiration to all

A lesson to learn from Divyang Bhavani

Most students consider Board Examination as a burden. The examination stress turns suicidal at times.

The will power shown by Divyang Bhavani is a lesson for the students. Divyang Bhavani Prasad has no shortage of passion and courage but she has no hands.

divyang bhavani

She is giving Class XII Board Examination now. Her dream is to become the collector of Jabalpur. She is learning Maths & Science group from APN School Sadar. Her mother Rani Yadav is fully confident on the abilities of Bhavani and proud of her and she takes daughter to the examination centre and back.

Bhavani was born without arms. But the parents decided to accept the challenge and trained her in all respects. She was trained to write and do all routine work using her legs instead of arms. Though the parents were not educated much – mother 8th pass and Father 10th pass, they dream of educating Bhavani to the maximum and they want to get her dream fulfilled.

Life is a challenge !

It was a challenge to get the child admitted to school and to educate her, but as things started succeeeding, the path became clearer., there were people who said, “you won’t be able to do this”. Now she operates computer and mobile phone easily with her legs.

Let’s wish her well !

Along with Class XII exam she is also appearing for IIT JEE. Let’s wish that all her dreams come true. Let’s take inspiration from her. We are here with all organs perfect and not utilising them properly to bring out our abilities and achieve maximum. Let’s pledge to work hard and propsper ourselves and helping the country to prosper.

Exotic scenes from Kavaratti Island Lakshadeep

I had an opportunity to visit Kavaratti, Lakshadeep and stay there for two weeks. I had a wonderful experience there. The photos are just exotic. Just return around and click, every time I get excellent sceneries. Beautiful ones. The greenish blue sea is just marvelous. The corals, coconut trees, friendly people, freak and tasty fish especially the tunas… Just incredibly the best experience I had ever.
He are some photos of Kavaratti and Agatti islands.

image (more…)

Remembering Verghese Kurien “Father of White Revolution in India”

Today 26 November 2015 is the 94th birthday of Verghese Kurien popularly known as “Father of White Revolution in India”. He founded around 30 institutions of excellence (like AMUL, GCMMF, IRMA, NDDB) which are owned, managed by farmers and run by professionals. As the founding chairman of the Gujarat Co-operative Milk Marketing Federation (GCMMF), Kurien was responsible for the creation and success of the Amul brand of dairy products.

Google celebrated the 94th birthday of Verghese Kurien by this doodle

verghese-kuriens-94th-birthday-4760371399229440-hp

Get more details here

Score More in Physics without fear – A Physics teacher’s advice

When I interacted with students of class 11 and 12, I came to know that Physics is one of the subjects they FEAR most during exam time. Though it seems difficult to score high marks, it is not actually so. Here are some suggestions you can easily follow to score more in Physics without much strain.

“Nobody plans to fail, but plans to fail”

Yes, A well planned study habit is essential to score more.

If you analyse the pattern of exam in class XI and XII (CBSE) the most of the marks are distributed among 3 marks questions and 5 marks questions which emphasizes the knowledge of concepts. SO, if you find it difficult to pass, then the following plan of action will easily work out.

  • Identify all portions from which 5 marks questions can be asked and practice them well.
  • Identify all portions from which three marks questions can be asked and practice them well.
  • Learn all Laws, definitions, principles
  • Practice all diagrams.
  • Practice all solved problems given in text

These links may be helpful

http://physics.2lv.in/must-practice-questions-for-cbse-physics-class-12-solved/

http://www.plustwophysics.com/set-of-must-practice-questions-for-cbse-physics-class-xii-aissce-physics-2011/

Just try this routine and see whether you are scoring more or not.

For those already got pass marks can also try the above to better plus

  • Solve all exercises and additional exercises from NCERT Textbook.
  • Get a collection of all one marks questions and Two marks questions preferably from previous ten years’ question papers and find answers to them.

Those who want to excel further and look forward to entrance examinations, IIT, MBBS etc the following links to books will help.

 

How Stephen Hawking lived so long with ALS?

It is normally observed that a person with ALS (Amyotropic Lateral Sclerosis) succumbs to death within five years. Stephen Hawking‘s condition was first diagnosed when he was 21, and he was not expected to see his 25th birthday. But how he managed to “actively” to his 72 years of age? This is a matter to be discussed.

What is ALS?

ALS stands for Amyotropic Lateral Sclerosis and is a motor neuron disease. Also known as as Lou Gehrig’s disease after an American baseball first baseman who played 17 seasons in Major League Baseball (MLB) for the New York Yankees (1923–1939);  and in 1995 Gehrig’s streak ended in 1939 after he was diagnosed with amyotrophic lateral sclerosis (ALS) which forced him to retire at age 36 and claimed his life two years later.

ALS is a neuro degenerative disease.

What causes ALS?

Structure of target enzyme

The exact cause of LAS is not known. 5% to 10% caused by a defective gene that prevents the body from producing a normal amount of an enzyme called superoxide dismutase. This enzyme helps neutralize free radicals — highly reactive oxygen molecules produced during metabolism and capable of damaging body tissues. Researchers speculate that defects in protective enzymes may also account for non-inherited ALS and that environmental toxins may be a factor.

Some evidence suggests that the disease may be triggered by exposure to heavy metals, animal hides, or fertilizers, although this is by no means proven. In addition, viral infection and severe physical trauma have been implicated as possible contributors. Other theories link ALS to a phenomenon called excitotoxicity, in which the nerve cells that control movement are overstimulated by a neurotransmitter called glutamate to the point where they eventually die.

How ALS kills?

Life expectancy turns on two things: the motor neurons running the diaphragm—the breathing muscles. So the common way people die is of respiratory failure. And the other thing is the deterioration of swallowing muscles, and that can lead to malnutrition and dehydration.

Stephen Hawking

Stephen Hawking was predicted to leave this world at the age of 25, but now he is going to be 72! What made him live so long (Thank God!)?

Many account the round the clock medical care and the sophisticated environment to be responsible for his longevity.

But, the biological setup, the will power, the affirmation of self to go on to better heights despite the problems ….

What do you think?

Read More …

What is amyotrophic lateral sclerosis?
Who gets ALS?
What are the symptoms?
How is ALS diagnosed?
What causes ALS?
How is ALS treated?
What research is being done?
How Can I Help Research?
Where can I get more information?

Neutrino detectors can be used to detect nuclear weapons

Yes! Neutrino detectors can be used to detect nuclear weapons. (Ref: The above story is based on materials provided by Virginia Tech. )

cmsPhysicists at the Large Hadron Collider in Switzerland  look to subatomic particles called neutrinos to answer the big questions about the universe.

Neutrinos are produced by the decay of radioactive elements, and nuclear reactors produce large amounts of neutrinos that cannot be shielded or disguised, which could help regulatory agencies monitor plutonium production.

Measuring neutrino emissions allows scientists to infer the plutonium content of a reactor from outside the building, according to a letter in Physical Review Letters written by Patrick Huber, an associate professor of physics and a member of the Center for Neutrino Physics at Virginia Tech, with Thomas Shea, a 20-year veteran of the International Atomic Energy Agency, and graduate students Eric Christensen of Westminster, Maryland, a doctoral student in physics, and Patrick Jaffke of Arlington, Virginia, a doctoral student in physics and a master’s student in nuclear engineering.

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