What is the appropriate reaction equation of water vapour and carbon dioxide?

The appropriate reaction equation for the interaction of water vapor (H₂O) and carbon dioxide (CO₂) can be represented as a physical process rather than a chemical reaction, as they do not react to form new compounds under normal conditions. However, in photosynthesis, water and carbon dioxide are reactants in the overall equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, where glucose and oxygen are produced. This highlights the important role of both substances in biological processes.