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Determination of Heat Capacity Ratio

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  1. Objective for experiment 1
  2. Objective for experiment 2
  3. Background
  4. Method for experiment 1
  5. Discussion for experiment 1
  6. Method for experiment 2
  7. Discussion for experiment 2

Objective for experiment 1:
To determine the heat capacity ratio of air by following a modernised version of the experiment attributed to Shoemaker. The experiment is to determine the heat capacity ratio of air, by emulating an adiabatic expansion of air.

Objective for experiment 2:
The objective is to calculate the volume ratio of two vessels for air. This calculated by using an isothermal expansion.

[...] The difference between and adiabatic and an isothermal is that an adiabatic doesn't necessarily mean the temperature of the system is constant but there is no heat exchange occurring. In Thermodynamics, there are three different types of systems; open systems, closed systems and isolated systems. An open system is one that will exchange both energy and matter with the surroundings, however with a closed system it will not exchange matter only energy. Alternatively, an isolated system will not exchange energy and matter with the surroundings. If a thermo-bottle had perfect insulation is would be considered a fully isolated system as there is no exchange in matter or heat. [...]


[...] Method for experiment 1 To determine the Heat Capacity Ratio of air we used a barometer the apparatus shown in figure Expansion Processes of a Perfect Gas Apparatus, Armfield Limited'. Using the barometer the first step was to measure the atmospheric pressure. The next step was to close the ball valves V1 and V3 then open V4. V1 allows air to exit the vessel to the surroundings once it has been pressurised where as V3 allows air to enter a vessel once a vacuum has been formed in the vessel. [...]


[...] The experiment is to determine the heat capacity ratio of air, by emulating an adiabatic expansion of air. Objective for experiment The objective is to calculate the volume ratio of two vessels for air. This calculated by using an isothermal expansion. Background The 1st law of Thermodynamics is the conservation of energy for thermodynamic systems, meaning that heat cannot be created or destroyed. Thermal energy can therefore be converted into various forms of energy. To calculate the change of internal energy of a given system the formula shown in figure 1 is used: Q represents the amount of heat added to a system and W represents the Work done. [...]

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