Temperature High

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Temperature High
Temperature High
Do we really need a high temperature oil seal?


Do we really need a high temperature oil seal for the front transaxle differential that's on the engine side?

I doubt it but a high temp seal is not any more money than a regular one anyway.



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High-Temperature Electric Oven


High-Temperature Electric Oven


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Overview:Withstands up to 300'C high temperature

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- Withstands high temperature- Designed for industrial use- Size: 6mm in width

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High Temperature Electronics covers a very active and topical area. This text reviews in detail the trends and options for electronic materials in high temperature environments. The contributors are leading authorities from several countries to provide an international appeal. After an introduction to the subject, users of these materials (e.g. aircraft and space, automotive, military and power industries) are considered. A discussion of silicon and gallium arsenide electronics is followed by an assessment of the future for electronic materials and devices. Author: Hartnagel, H. L./ Willander, M./ Willander, Magnus Series Title: Electronic Materials Series Binding Type: Hardcover Number of Pages: 336 Publication Date: 1996/12/31 Language: English Dimensions: 6.14 x 9.21 x 0.81 inches

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The book describes all basic experimental facts about high temperature superconductivity of materials, with a critical temperature of 30 Kelvin and higher, and explains them microscopically starting with a Hamiltonian followed by stepbystep statistical mechanical calculations. All important theoretical formulas are derived without omitting steps and all basic questions are answered in a manner which is easy to understand. The book is therefore suitable as a textbook for a secondyear graduate physics course. Many fresh, and some challenging, ideas are presented and researches in the field are invited to examine the text. Author: Fujita, Shigeji/ Fujita/ Fujita, S. Series Title: Fundamental Theories of Physics Series Number: 121 Binding Type: Hardcover Number of Pages: 388 Publication Date: 2002/01/01 Language: English Dimensions: 9.18 x 7.06 x 1.08 inches


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High-Temperature Superconductivity



Why, if the desire is to produce ammonia industrially, is the reaction run at the high temperature?


The reaction to produce ammonia is an equilibrium :
N2(g) + 3 H2(g) == 2NH3(g)

At 300K the equilibrium constant is 3 x 108 and at 700 the equilibrium constant is 0.3. Industrially the reaction is run at the higher temperature even though the ratio of products to reactants in the equilibrium mixture is much much less than the lower temperature. Why, if the desire is to produce ammonia industrially, is the reaction run at the high temperature?

I would assume that it is because the activation energy for the reaction is extremely high. The equilibrium constant is more favorable at the lower temperature, but the reaction proceeds so slowly that the equilibrium is never reached.

K = k^1 / k^-1
K = equilibrium constant
k^1 = rate constant of forward reaction
k^-1 = rate constant of back reaction

What is important here is really k^1, which changes with temperature. At 300 kelvin, K > 1 and the equilibrium favors NH3. But, k^1 and k^-1 are both extremely small. Therefore, hardly any of the N2 and H2 react.

At 700 kelvin, K < 1 and the equilibrium favors N2 and H2. But in this case, both k^1 and k^-1 are large enough that a significant amount of the gases are reacting.


One Comment

  1. hairydoginparis
    Posted November 9, 2011 at 1:52 am | Permalink

    Your writing is not clean. Your PPs are not clear. You are over writing.

    Let's just take the beginning.
    The dead of the winter was beginning thaw on the seventh day of the girl's promise. Lighter jackets were starting to appear on Northview High School's students. It became more acceptable to wear t-shirts or three-quarter length shirts. Bit by bit, life was being breathed back into the world.

    On the seventh day, winter was beginning to thaw. Students came in lighter jackets, t-shirts appeared. The world was coming to life.

    Half the words, and all of the ideas, as far as I can see. Tighten it up, we'll read more eagerly.