What is an Equation of State?
Usually defined as EOS, they express a relationship of temperature (T), pressure (P), volume (V), internal energy or specific heat. They are often used to characterize the state of a matter or material given certain conditions. They can be applied to gases, solids, fluids and mixtures.
For example: EOS are used in mineral physics to determine mineral composition at depth like their atomic structure, chemical bonding and stability of a material. The simplest equation of state is the one for ideal gases: PV = nRT
Where, n is the number of moles, R is the gas constant and V is the volume of the ideal gas that experiences an external pressure P. However, when the system is at high pressure and low temperature, real gases deviate from ideal gas law and the equation needs to be modified, such as in the Van der Waals equation of state. In the case of solids and liquids, pressure is a lot more important as it has a greater effect on temperature. Therefore, usually it is easier to consider initially an isothermal EOS and then introduce a coefficient as the temperature correction.
Remember that all EOS are based on assumptions!
Usually defined as EOS, they express a relationship of temperature (T), pressure (P), volume (V), internal energy or specific heat. They are often used to characterize the state of a matter or material given certain conditions. They can be applied to gases, solids, fluids and mixtures.
For example: EOS are used in mineral physics to determine mineral composition at depth like their atomic structure, chemical bonding and stability of a material. The simplest equation of state is the one for ideal gases: PV = nRT
Where, n is the number of moles, R is the gas constant and V is the volume of the ideal gas that experiences an external pressure P. However, when the system is at high pressure and low temperature, real gases deviate from ideal gas law and the equation needs to be modified, such as in the Van der Waals equation of state. In the case of solids and liquids, pressure is a lot more important as it has a greater effect on temperature. Therefore, usually it is easier to consider initially an isothermal EOS and then introduce a coefficient as the temperature correction.
Remember that all EOS are based on assumptions!
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![]() To calculate the fugacity, sometimes is necessary to use Equations of State or EOS. In this section you can find information of the different EOS The equation is chosen depending on the conditions of the system. VIDEO!
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