Gas geochemistry and gas chemistry are two distinct yet interconnected disciplines.

Gas geochemistry is a branch of Earth science that primarily investigates the origin, distribution, circulation, and interactions of various gases in the Earth's atmosphere. It focuses on gases in Earth's major spheres, such as helium, nitrogen, oxygen, carbon dioxide, and other components, aiming to understand the chemical composition of the Earth's atmosphere and reveal the roles and influences of gases in the Earth system. By examining the composition and distribution of these gases, scientists can uncover their chemical characteristics. The study of the origin of gases is another important aspect of gas geochemistry, involving the impact of both natural processes and human activities on gas generation.

A deeper understanding of the sources of gases helps determine their cycling pathways in the Earth system. Additionally, gas geochemistry examines the movement and circulation of gases in the atmosphere, revealing their transfer and exchange processes within the Earth system. The interaction between different gases is also a significant focus in this field. Finally, gas geochemistry delves into the profound impact of various gases on climate, meteorology, and ecosystems, including the role of greenhouse gases, providing a scientific basis for understanding global warming and climate change.

On the other hand, gas chemistry is a branch of chemistry that concentrates on the study of chemical reactions and molecular interactions in the gaseous state. It involves aspects such as the structure, energy, and reaction kinetics of gas molecules, aiming to comprehend the chemical properties of the gas phase. Gas chemistry explores the mechanisms of gas-phase reactions, including interactions between gas molecules, providing a theoretical foundation for understanding the fundamental properties and chemical processes of gases.

While their research focuses may differ, there is an intersection between the two fields. For instance, findings from gas geochemistry contribute background knowledge for understanding gas reactions in the atmosphere, and principles from gas chemistry help explain the behavior of gases in the atmosphere. Overall, these two disciplines complement each other, collectively providing a rich understanding of the Earth's atmosphere and its chemical processes. By comprehensively examining the position of gases in the Earth system and their behavior in chemical reactions, we gain a more thorough understanding of the roles and impacts of gases in the natural world.