**4. Energy coupling**

The water in the tissues is the fundamental cause of energy absorption in the human body: the more liquid accumulates in an area, the more energy is absorbed [4] (Romanenko et Al 2017). Being able to recognize the amount of energy that penetrates allows you to locate the area of inflammation. When the radio frequency wave penetrates the tissue, it moves water molecules. Remember that water molecules are a dipole, hence they vibrate with the waves as shown in **Figure 1**.

**Figure 1.** *Movement of water molecules due to radiofrequency oscillations.*
