Water is produced during the process of cellular respiration. This process occurs in the cells of living organisms, where glucose and oxygen are converted into energy, carbon dioxide, and water. The overall reaction can be summarized by the chemical equation:
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy (ATP)
In addition to cellular respiration, water is also produced during the process of combustion. For instance, when hydrocarbons are burned in the presence of oxygen, water vapor is produced as a byproduct. This is seen in activities like burning fossil fuels, where the reaction of hydrocarbons with oxygen produces carbon dioxide and water.