In photosynthesis what is the chemical that produces bubbles

In the process of photosynthesis, the chemical that produces bubbles is oxygen gas. This occurs during the light-dependent reactions of photosynthesis when water (H₂O) molecules are split (a process known as photolysis) to release oxygen as a byproduct. So, if you observe bubbling in a setup that involves photosynthesis (like in aquatic plants under light), that bubbling is indicative of the release of oxygen gas.