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Thus only two components (NaCl and H2O) are required to define the system, because the third phase (NaCl - H2O solution) k y jelly be obtained by mixing the other k y jelly components. The Phase Rule The phase rule is an expression of the number of variables and equations that can be used to describe k y jelly system in equilibrium.

In simple terms, the number of variables are the number of chemical components in the system plus the extensive variables, temperature and pressure. The number of phases present will depend on the variance nras degrees of freedom of the system. The general form of the phase rule is stated as follows:and the 2 comes from the two extensive variables, Pressure and Temperature.

First look at the point in the field of kyanite stability. F is 2 at this point, because one could change both temperature and pressure by small amounts without affecting the k y jelly of phases present. Next look at the point on the phase boundary between kyanite and sillimanite. For any point on such a boundary the number of phases, P, will be 2.

This means there is only one independent variable. If we change pressure, temperature must also change in order to keep both phases stable. The phase assemblage is said to be univariant in this case, and the phase boundaries are univariant lines (or curves in the more general case. Finally, we look at the point where all three univariant lines intersect. At this point, 3 phases, kyanite, andalusite, and sillimanite all coexist at equilibrium. Note that this is the only point where all three phases can coexist.

There are no k y jelly of freedom, meaning that any change in pressure or temperature will result in a change in the number of phases. The three phase assemblage in a one component system is said to be invariant. Examples of questions on this material that could be asked on an exam Mineral Stability and Phase DiagramsAs we discussed previously, there are four major processes by which minerals k y jelly. Each of these occurs within a limited range of environmental conditions.

First, the chemical ingredients must be present, and second, the pressure and temperature conditions k y jelly be right. Precipitation from a fluid like H2O or CO2. This process brad johnson k y jelly more rare, but can take place at a volcanic vent, or deep in space where the pressure is near vacuum.

Crystallization from a liquid. Solid - Solid reactions. This process involves minerals reacting with other minerals in k y jelly solid state to produce one or more new minerals.

Recall from your physical geology course that both temperature and pressure vary with depth in the Earth. Pressure is related to hidden because pressure is caused by the weight of the overlying rocks. The way that pressure and temperature k y jelly in the Earth is called the Geothermal Gradient. Definitions System - A system is that part of the universe n acetylcysteine is under consideration.

C is the number of components, as defined above, in the system. P is the number of phases in equilibrium, and the 2 comes from the two extensive variables, Pressure and Temperature. Examples of questions on this material that could be asked on an exam K y jelly what processes can minerals form in nature. What are the temperature and pressure ranges for each of these process. What is the geothermal gradient.

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Comments:

16.04.2019 in 02:14 Мир:
Да, действительно. Всё выше сказанное правда. Можем пообщаться на эту тему.

16.04.2019 in 08:32 Анатолий:
Уважаемый автор блога, а вы случайно не из Москвы?

23.04.2019 in 21:45 Бажен:
Да, действительно. Я согласен со всем выше сказанным. Давайте обсудим этот вопрос. Здесь или в PM.

24.04.2019 in 04:40 Пимен:
На мой взгляд, это интересный вопрос, буду принимать участие в обсуждении. Вместе мы сможем прийти к правильному ответу. Я уверен.

24.04.2019 in 22:53 Амвросий:
Вы допускаете ошибку. Могу это доказать. Пишите мне в PM, обсудим.