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- Heat_capacity_ratio abstract "The heat capacity ratio or adiabatic index or ratio of specific heats, is the ratio of the heat capacity at constant pressure to heat capacity at constant volume . It is sometimes also known as the isentropic expansion factor and is denoted by (gamma)(for ideal gas) or (kappa)(isentropic exponent, for real gas). The former symbol gamma is primarily used by chemical engineers. Mechanical engineers use the Roman letter .where, is the heat capacity and the specific heat capacity (heat capacity per unit mass) of a gas. Suffix and refer to constant pressure and constant volume conditions respectively.To understand this relation, consider the following thought experiment.A closed pneumatic cylinder contains air. The piston is locked. The pressure inside is equal to the outside air pressure. This cylinder is heated to a certain target temperature. Since the piston cannot move, the volume is constant. The temperature and pressure will rise. When the target temperature is reached, the heating is stopped. The amount of energy added equals . The piston is now freed and moves outwards, expanding without exchange of heat (adiabatic expansion). Doing this work it cools the air inside the cylinder to below the target temperature. To return to the target temperature (still with a free piston), the air must be heated. This extra heat amounts to about 40% more than the previous amount added. In this example, the amount of heat added with a locked piston is proportional to , whereas the total amount of heat added is proportional to . Therefore, the heat capacity ratio in this example is 1.4.Another way of understanding the difference between and is that applies if work is done to the system which causes a change in volume (e.g. by moving a piston so as to compress the contents of a cylinder), or if work is done by the system which changes its temperature (e.g. heating the gas in a cylinder to cause a piston to move). applies only if - that is, the work done - is zero. Consider the difference between adding heat to the gas with a locked piston, and adding heat with a piston free to move, so that pressure remains constant. In the second case, the gas will both heat and expand, causing the piston to do mechanical work on the atmosphere. The heat that is added to the gas goes only partly into heating the gas, while the rest is transformed into the mechanical work performed by the piston. In the first, constant-volume case (locked piston) there is no external motion, and thus no mechanical work is done on the atmosphere; is used. In the second case, additional work is done as the volume changes, so the amount of heat required to raise the gas temperature (the specific heat capacity) is higher for this constant pressure case.".
- Heat_capacity_ratio wikiPageID "1949009".
- Heat_capacity_ratio wikiPageRevisionID "604948729".
- Heat_capacity_ratio hasPhotoCollection Heat_capacity_ratio.
- Heat_capacity_ratio subject Category:Physical_quantities.
- Heat_capacity_ratio subject Category:Ratios.
- Heat_capacity_ratio subject Category:Thermodynamics.
- Heat_capacity_ratio type Abstraction100002137.
- Heat_capacity_ratio type MagnitudeRelation113815152.
- Heat_capacity_ratio type Measure100033615.
- Heat_capacity_ratio type PhysicalQuantities.
- Heat_capacity_ratio type Ratio113819207.
- Heat_capacity_ratio type Ratios.
- Heat_capacity_ratio type Relation100031921.
- Heat_capacity_ratio comment "The heat capacity ratio or adiabatic index or ratio of specific heats, is the ratio of the heat capacity at constant pressure to heat capacity at constant volume . It is sometimes also known as the isentropic expansion factor and is denoted by (gamma)(for ideal gas) or (kappa)(isentropic exponent, for real gas). The former symbol gamma is primarily used by chemical engineers.".
- Heat_capacity_ratio label "Coefficiente di dilatazione adiabatica".
- Heat_capacity_ratio label "Coeficiente de dilatación adiabática".
- Heat_capacity_ratio label "Coeficiente de expansão adiabática".
- Heat_capacity_ratio label "Heat capacity ratio".
- Heat_capacity_ratio label "Indice adiabatique".
- Heat_capacity_ratio label "Isentropenexponent".
- Heat_capacity_ratio label "Wykładnik adiabaty".
- Heat_capacity_ratio label "Показатель адиабаты".
- Heat_capacity_ratio label "比熱比".
- Heat_capacity_ratio label "绝热指数".
- Heat_capacity_ratio sameAs Poissonova_konstanta.
- Heat_capacity_ratio sameAs Isentropenexponent.
- Heat_capacity_ratio sameAs Coeficiente_de_dilatación_adiabática.
- Heat_capacity_ratio sameAs Indice_adiabatique.
- Heat_capacity_ratio sameAs Coefficiente_di_dilatazione_adiabatica.
- Heat_capacity_ratio sameAs 比熱比.
- Heat_capacity_ratio sameAs Wykładnik_adiabaty.
- Heat_capacity_ratio sameAs Coeficiente_de_expansão_adiabática.
- Heat_capacity_ratio sameAs m.0687xq.
- Heat_capacity_ratio sameAs Q503869.
- Heat_capacity_ratio sameAs Q503869.
- Heat_capacity_ratio sameAs Heat_capacity_ratio.
- Heat_capacity_ratio wasDerivedFrom Heat_capacity_ratio?oldid=604948729.
- Heat_capacity_ratio isPrimaryTopicOf Heat_capacity_ratio.