Here's why:

* pH scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14, with:

* 0 being the most acidic

* 7 being neutral (like pure water)

* 14 being the most alkaline (basic)

* Strong acids: Strong acids completely ionize (break apart) in water, releasing a high concentration of hydrogen ions (H+).

* Hydrogen ions and pH: The presence of hydrogen ions is what makes a solution acidic. The more hydrogen ions, the lower the pH.

Therefore, a strong acid will have a low pH value, typically below 3.