Dissolved gases are gases that are mixed into liquids, such as water. Common examples include oxygen and carbon dioxide, which are essential for aquatic life. These gases can enter the liquid through processes like diffusion from the atmosphere or through biological activities, such as photosynthesis in plants. The amount of gas that can dissolve in a liquid depends on factors like temperature and pressure. For instance, colder water can hold more dissolved gases than warmer water. Understanding dissolved gases is important for maintaining healthy ecosystems and for various industrial processes, including those involving aquaculture and water treatment.