Final answer:
Cooking an omelette is an example of a process obeying the law of conservation of mass. The total mass of the ingredients before and after cooking remains the same.
Step-by-step explanation:
An example of a process obeying the law of conservation of mass in everyday life is cooking an omelette. When you cook an omelette, the ingredients undergo a chemical reaction where the proteins denature and coagulate. Despite the changes in appearance and taste, the total mass of the ingredients before and after cooking remains the same.
For example, let's say you have 100 grams of eggs, 50 grams of cheese, and 20 grams of vegetables before cooking an omelette. After cooking, the mass of the omelette might be slightly less due to evaporation of water, but the total mass of the cooked omelette (eggs, cheese, and vegetables) would still be close to 170 grams.