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See also: The Best Leadership Quotes

An artist is a creature driven by demons. He doesn’t know why they choose him and he’s usually too busy to wonder why. William Faulkner

I must create a system, or be enslaved by another man’s. I will not reason and compare: my business is to create. William Blake

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion. Albert Camus

To do a dull thing with style-now that’s what I call art. Charles Bukowski

That man is a success who has lived well, laughed often and loved much. Robert Louis Stevenson

If a little dreaming is dangerous, the cure for it is not to dream less but to dream more, to dream all the time. Marcel Proust

You’ll never change your life until you change something you do daily. The secret of your success is found in your daily routine. John C. Maxwell

Don’t think about what can happen in a month. Don’t think about what can happen in a year. Just focus on the 24 hours in front of you and do what you can to get closer to where you want to be.

It is now how good you are, it’s how good you want to be. Unknown

When you’re not concerned with succeeding, you can work with complete freedom . Larry David

If you care enough for a result, you will most certainly attain it. William James

Success or failure depends more upon attitude than upon capacity successful men act as though they have accomplished or are enjoying something. Soon it becomes a reality. Act, look, feel successful, conduct yourself accordingly, and you will be amazed at the positive results. William James

Reduce your plan to writing. The moment you complete this, you will have definitely given concrete form to the intangible desire. Napoleon Hill

No matter what challenges or setbacks and disappointments you may encounter along the way, you will find true success and happiness if you have only one goal. There really is only one. And that is this: to fulfill the highest most truthful expression of yourself as a human being. You want to max out your humanity by using your energy to lift yourself up, your family and the people around you. Oprah Winfrey

The most successful people are those who are good at plan B. James Yorke

Anyone who lives within their means suffers from a lack of imagination. Oscar Wilde

Some are born great, others achieve greatness. William Shakespeare

If you seek truth you will not seek victory by dishonorable means, and if you find truth you will become invincible. Epictetus

Seek not greatness, but seek truth and you will find both. Horace Mann Womens Leather Bucket Bag Chloé How Much Discount Pay With Visa Outlet Sneakernews R1RELQ6J1

Nothing is more powerful than an idea whose time has come. Victor Hugo

In dreams begin responsibilities. W. B. Yeats

Photo by: Laure Fons

Overview

Potassium is one of the alkali metals. The alkali metals are the elements that make up Group 1 (IA) of the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. The alkali metals also include lithium, sodium, rubidium, cesium, and francium. They are among the most active metals.

Potassium is so active that it never occurs free in nature. It always occurs in compounds, combined with other elements. It was first prepared in pure form in 1807 by English chemist Sir Humphry Davy (1778-1829). Davy used a new method of isolating elements that he had invented, electrolysis. In electrolysis, an electric current is passed through a molten (melted) compound. The electrical current breaks the compound into its elements. (See sidebar on Davy in the calcium entry in Volume 1.)

There are very few uses for potassium as a pure element. However, compounds of potassium have many important applications, the most important of which is as a fertilizer.

K

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Group 1 (IA) Alkali metal

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Discovery and naming

Early humans were familiar with potash, a potassium compound that forms when wood burns. Wood ashes were washed with water to dissolve the potash. It was then recovered by evaporating the water. Potash was often called vegetable alkali. That name comes from the origin of the material ("vegetable" plants that contain wood) and the most important property of the material, alkali. The word alkali means a strong, harsh chemical that can be used for cleaning. Common household lye (such as Drano) is a typical alkali.

The chemical name for potash is potassium carbonate (K CO ). Early humans also knew about a similar substance called mineral alkali. This material was made from certain kinds of rocks. But it also had alkali properties. "Mineral alkali" was also called soda ash. The modern chemical name for soda ash is sodium carbonate (Na CO ).

For many centuries, people had trouble telling "vegetable alkali" and "mineral alkali" apart. The two materials looked and acted very much alike. For example, they could both be used as cleaning materials. The main difference between them was the source from which they came. It was not until the eighteenth century that chemists understood the difference between potash (vegetable alkali) and soda ash (mineral alkali).

By the late 1700s, chemists were reasonably sure that both potash and soda ash contained elements they had never seen. They tried to think of ways to break these compounds down into their elements. The first method that Davy tried was to pass an electric current through a water solution of one compound or the other. But no new element was ever formed. What Davy did not know was how active the elements potassium and sodium are. Both elements are freed when an electric current is passed through a water solution of potash or soda ash. But as soon as the element is formed, it reacts immediately with the water. The free element can never be recovered by this method.

Then Davy thought of another way to separate potash and soda ash into their elements. He decided to use no water in his experiment. Instead, he melted a sample of potash and a sample of soda ash. Then he passed an electric current through the molten (melted) substances. He was amazed to see a tiny liquid droplet of metal formed in each case. The droplet was the first piece of potassium and sodium ever to be seen by a human.

Davy had his first success with potassium using this approach on October 6, 1807. A few days later he repeated his experiment with soda ash and produced pure sodium metal. Davy named these two elements after their much older names: potassium for "potash" and sodium for "soda ash."

Physical properties

Potassium is a soft, silvery-white metal with a melting point of 63°C (145°F) and a boiling point of 770°C (1,420°F). Its density is 0.862 grams per cubic centimeter, less than that of water (1.00 grams per cubic centimeter). That means that potassium metal can float on water. Chemically, though, that's not a good idea (see "Chemical properties" below).

The melting point of potassium is very low for a metal. It will melt over the flame of a candle flame.

Chemical properties

Like the other alkali metals, potassium is very active. It reacts with water violently and gives off gas: So much heat is produced in this reaction that the hydrogen gas actually catches fire and may explode. Floating potassium metal on the surface of water is not a good idea! In that instance, the potassium would skip along the surface of the water. The skipping is caused by hydrogen gas produced in the reaction pushing the metal around. The potassium would soon catch fire, burn, and, perhaps, explode.

Potassium reacts readily with all acids and with all non-metals, such as and

Potassium is the eighth most abundant element in the Earth's crust. Its abundance is estimated to be about 2.0 to 2.5 percent. It is just slightly less abundant than its alkali cousin, sodium.

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PROGRAM REQUIREMENTS

It takes something unique to succeed in Air Force ROTC. It takes dedication. Drive. Discipline.Air Force ROTC's program is structured to foster the work ethic and principles that will help students not only succeed in school but also prepare themfor life as exceptional citizens and members of the U.S. Air Force.

Here you’ll find everything you need to know about ROTC requirements and what it takes to succeed in Air Force ROTC.

Air Force ROTC is a program structured like a college course that focuses on developing leaders. ROTC courses are considered electives for which you’ll receive academic credit.

You will be taught by a world-class military faculty supplemented with distinguished speakers who bring policy and history to life through firsthand experience. Each instructor is an active duty Air Force Officer and is usually accorded the academic rank of assistant professor. The unit commander has an academic rank of full professor.

On this site, you’ll find all the information you need as you consider ROTC and a future with the U.S. Air Force. If you’d like to talk to someone about how Air Force ROTC fits into your college experience, feel free to contact us .

Since the goal of the program is to help students earn placement as an Officer in the U.S. Air Force, you will need to meet certain requirements along the way to help you ensure future success in the U.S. Air Force.

3 4-YEAR PROGRAM DETAILS

To become a Commissioned Officer in the U.S. Air Force, students must complete the three- or four-year AFROTC program. Therefore, it’s a good idea to enroll in AFROTC at the same time you enroll in your first college courses.

As you progress, you’ll move from the General Military Course (GMC) in your freshman and sophmore years to the Professional Officer Course (POC) in your junior and senior years.

GENERAL MILITARY COURSE

The first section of Air Force ROTC, the General Military Course, is a two-year program offered to freshmen and sophomores who meet the minimum requirements. It consists of one hour of classroom work and one to two hours of Leadership Laboratory each week. The General Military Course is designed to improve communication skills and provide a window into military life. It’s an opportunity for students to try out the program with no obligation (for those not on an ROTC scholarship).

The General Military Course (GMC)

There are a few minimum requirements for the General Military Course. Every freshman and sophomore must be:

The following conditions may preclude you from Air Force ROTC membership but will not keep you from enrolling in an aerospace studies class:

PROFESSIONAL OFFICER COURSE REQUIREMENTS

After completing General Military Course requirements, if students wish to be considered for entry into the last two years of the program, the Professional Officer Course, they must meet certain requirements. This system uses qualitative factors, such as grade point average, unit commander evaluation and aptitude test scores, to determine if a candidate has officer potential. After selection, before entering the Professional Officer Course, you must successfully complete a 24-day summer field-training exercise at Maxwell AFB, Alabama. Once you’re enrolled in POC, you’ll attend class three hours a week and participate in a one- to two-hour weekly Leadership Laboratory.

The Professional Officer Course is offered to juniors and seniors who have already committed to a four-year postgraduation service commitment with the Air Force. You must meet all the GMC (General Military Course) membership requirements and:

Physical Fitness Test (PFT)

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