Knowing the critical role “pH” in respect to the body and health cannot be overstated. Because the body is a colloidal (liquid and mineral) system, pH is the thermometer of life and health for the body. Out of balance pH describers a metabolic condition that is the precondition for sickness and disease. The need for understanding pH is therefore a critical concept and its importance cannot be overstated. The purpose of this article is to introduce a definition of pH and a perspective on its importance in the body. The combination of two Hydrogen atoms with one Oxygen atom forms the “miracle” substance of life on this planet ? WATER. Water not only makes up 70% of the planet, it also makes up about 70% of the human body. A large majority of all we are physically is simply hydrogen and oxygen.As it turns out, the function of these two atoms Ringing in the ears are essential to our body’s ability to live. Without oxygen, the complex human cell will not operate. The hydrogen atom is a major player in the metabolic and chemical reactions of body as well. The combination of these two atoms (water) plays a major role in all the processes of physical life. A certain number of molecules of water (H2O) naturally dissociate into the hydrogen H+ ion and into the OH- ion. The relationship between the concentrations of these two dissociated ions is expression with what is called the pH scale. The term pH stands for “potential” of “Hydrogen”. The more hydrogen ions, the more acidic the solution is. The fewer hydrogen ions the more alkaline (base) the solution is.Just as the kilometer is a measure of distance, and the hour a measure of time, the pH unit measures the degree of acidity or basicity of a solution.