Various measurement methods are used to determine the internal volume, especially of bodies with complex internal volumes. A good example of such bodies is the gas expansion method. In this method, the unknown internal volume is related to the known reference internal volume. The volume is determined by the pressure ratios formed between the separate and connected connection in the system. The problem
arises in determining the reference volume, where its internal volume can be difficult to determine due to the rounding of the edges. Therefore, a known reference body can
be taken as a reference value, which is easier to determine in terms of the volume it occupies. Thus, we can determine two unknown internal volumes at the same time with one known external volume. In the experimental part of the diploma thesis, I designed a measuring system with a larger number of reference bodies. I mainly was interested in the final measurement uncertainty and the influence of the number of
inserted reference bodies on the final uncertainty of the obtained results. I achieved an uncertainty of the result within 2,1 % and 2,4 %. I found that the temperature stability and the size of the reference body are the highest influence on the final uncertainty of the results of the measured volumes.
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