Science Springs

NASA Chandra

“Chemistry, the study of the intricate dances and bondings of low-energy electrons to form the molecules that make up the world we live in, may seem far removed from the thermonuclear heat in the interiors of stars and the awesome power of supernovas. Yet, there is a fundamental connection between them.

To illustrate this connection, the familiar periodic table of elements—found in virtually every chemistry class—has been adapted to show how astronomers see the chemical Universe. What leaps out of this table is that the simplest elements, hydrogen and helium, are far and away the most abundant.

PeriodicTable2

The Universe started out with baryonic matter in its simplest form, hydrogen. In just the first 20 minutes or so after the Big Bang, about 25% of the hydrogen was converted to helium. In essence, the chemical history of the Universe can be divided into two mainphases: one lasting 20…

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Oleh: sunyonoms | Juli 31, 2013

WILLIAM PROUT (1785-1850)

A History of Science

1815 – UK

‘Atoms are not the smallest thing’

After ANTOINE LAVOISIER had compiled his list of the then known elements, another 32 were added in the years following his death. Fifty kinds of fundamental building blocks for matter seemed excessive. In 1815 Prout, using AVOGADRO’s method of comparing the relative densities and weights of gases, proposed that all atoms appeared to have weights that were exact multiples of the weight of the lightest atom, hydrogen, and that the different atomic weights of elements are whole-number multiples of the atomic weight of hydrogen (Prout’s hypothesis).

He took this as proof that all atoms were actually made from hydrogen atoms and the idea was adopted as atomic theory and used for later investigations of atomic weights and the classification of the elements.

If all atoms are made from atoms of hydrogen, then it could be possible to transform an…

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Oleh: sunyonoms | Juni 10, 2013

Understanding: Chemistry Part 1

White Coat Journey

“Any fool can know. The point is to understand.”

– Albert Einstein

If you  read my previous posts, you  have learned  I am trying to return to school for biology in the fall, with the ultimate goal of getting into med school. As I  also said before, I work better when I am thinking in the context of working toward something. Most importantly, however, I’m prone to obsessive behaviors. Once my mind is on something, I can’t seem to let it go, no matter how far-fetched the idea is (and if you ask my family, med school is considered far-fetched.)

So, to make sure  I’m going to be able to achieve my goals, I’ve decided to do some independent study before returning to college in August. What I’m most concerned about is science and math, mostly since I’ve only been in liberal arts since high school. Other than a semester’s…

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Oleh: sunyonoms | Juni 10, 2013

Why chemistry?

Finetraces786

بسم الله الرحمن الرحيم

Assalamu Alaikum,

For those of you who don’t know, I am studying to become a chemistry teacher. Don’t know if I will be teaching high school or college yet, but I start student teaching this fall. (Grad school applications are on hold until December.)

While preparing for student teaching (lesson planning, question sets, quirky labs, etc.), I started thinking about bigger questions:

Why teach chemistry?

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Oleh: sunyonoms | Mei 13, 2013

Diproteksi: Buku E-Learning

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Oleh: sunyonoms | Mei 9, 2013

Diproteksi: Buku-Buku Pendidikan

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Your mom is like science?

vapor-pressure

Volatile.

Submitted by Below Average.

{vapor pressure}

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Oleh: sunyonoms | April 27, 2013

Difference between a Chemical Engineer and Chemist

1Chic Geek

Often people ask me what i do? When I say that i am a chemical engineer, 100% of the time i get asked whether that entails wearing a white coat and working in a lab with chemicals. Answer to that is…. NO!

Chemists work with chemicals to generate products, chemical engineers design processes to mass produce the products. So although related they are quite different. I came across this picture which sums up the difference perfectly and the next time someone asks i think i’ll just show it to them. A picture says more then words right?

Difference between a chemist and a chemical engineer.

6680225_f496

xoxo

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Oleh: sunyonoms | April 21, 2013

Diproteksi: Buku Kimia Kuantum

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Sumber: http://sains.kompas.com/read/2011/06/30/22140717/
Tau
Matematika kini punya bilangan keramat baru, yakni 6,28. Bilangan keramat ini diperkenalkan oleh Bob Palais pada tahun 2001 sebagai pengganti 3,14 atau Pi yang biasa dikenal dalam perhitungan keliling dan luas lingkaran. Tahun lalu, bilangan keramat baru itu resmi dinamai “Tau” dan tanggal 28 Juni diperingati sebagai “Hari Tau”.

Kalau Pi adalah rasio antara keliling lingkaran dan diameternya, 6,28 atau Tau adalah rasio antara keliling lingkaran dan jari-jarinya. Bilangan keramat itu dinilai lebih sakti daripada Pi sehingga dinobatkan sebagai pengganti. Bila bilangan keramat tersebut digunakan, beberapa konsep matematika menjadi lebih sederhana sehingga mudah dimengerti.

Kevin Houston, pendukung Tau dan matematikawan dari University of Leeds, Inggris, menerangkan dalam video di YouTube tentang kelebihan Tau. “Ketika mengukur sudut, matematikawan tidak menggunakan derajat, tetapi radian. Ada 2Pi radian dalam satu lingkaran. Ini berarti seperempat lingkaran setara dengan 1/2Pi. Ini berarti, seperempat setara dengan setengah. Ini gila,” katanya.

“Mari kita pakai Tau. Seperempat lingkaran sama dengan seperempat Tau. Seperempat ya setara dengan seperempat. Bukankah ini lebih mudah untuk diingat? Demikian juga, tiga perempat lingkaran juga sama dengan tiga perempat Tau. Hal ini akan mencegah pelajar matematika, fisika dan teknik mengalami kesalahan konyol,” terang Houston.

Dalam artikel berjudul “Pi is Wrong” di mana bilangan 6,28 diperkenalkan tahun 2001, Palais mengungkapkan bahwa selama ribuan tahun, manusia telah memfokuskan pada bilangan matematika yang salah. “Peluang untuk menarik pelajar dengan penyederhanaan yang natural dan cantik telah membawa ke latihan yang membingungkan dalam latihan serta dogma,” tulis Palais.

Bila ternyata malah membuat bingung, haruskah Pi dihilangkan? Dikutip oleh Life Little Mysteries, Livescience, Rabu (29/6/2011), Houston berkomentar, “Pi tak harus dihilangkan. Saya memang pendukung Tau, tapi bukan anti Pi. Dengan demikian, siapa pun bisa memakai Pi jika mereka melakukan penghitungan yang melibatkan setengah Tau.”

Bagi para guru matematika, konsep Tau juga bisa mulai diperkenalkan. Apalagi, berdasarkan penelitian yang dilakukan Palais, terbukti bahwa Tau berhasil meningkatkan kemampuan pelajar dalam mempelajari matematika, terutama dalam konsep geometri dan trigonometri di mana faktor 2Pi lebih sering digunakan.

Tau sendiri dipilih sebagai simbol bilangan keramat baru dalam matematika secara independen oleh fisikawan dan matematikawan penulis “The Tau Manifesto”, Michael Hart dan pakar informasi asal Denmark, Harremoës. Tau dipilih karena kemiripannya dengan Pi sehingga cocok dengan ide beralih ke Tau.

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