This thesis addresses the key properties of hydrogen and natural gas with increased hydrogen concentration. Knowing them is important due to the continuous spreading of hydrogen as an energy carrier, which is expected to reduce carbon emissions and contribute to fulfilling various environmental goals. Properties are determined with the use of gas laws as well as some standards. They are shown in a wide temperature and pressure range, which is determined by considering conditions in the existing gas network. Results display hydrogen properties in explicit range and its effects on natural gas characteristics when added to in different concentrations. These results show the impact of hydrogen's low density on the properties of the gas mixture. Hydrogen's low caloric value per volume basis along with low Wobbe index are linked to its low density and also affect these characteristics of the mixture. The influence of hydrogen's distinctive negative Joule-Thomson coefficient which reduces the Joule-Thompson coefficient of natural gas and hydrogen mixture is also displayed in this thesis.
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