Sour makes you happy

If you bite into a lemon, you’ll find it’s sour. The body does care about how acidic it is inside. The so-called pH value, a measure of acidity, is regulated very precisely in the blood; otherwise, we would find ourselves in a life-threatening situation. The reason for this is that if the pH level is incorrect, the building blocks in the blood and the body’s cells will function too quickly or too slowly, or be destroyed. Breathing and the kidneys ensure that the pH level is maintained at exactly the right level. In many laboratory experiments, too, the correct pH level is often of crucial importance. See how you can determine the pH level using simple and straightforward methods. You and your children can try it for yourselves.