What is the pH scale?

pH stands for "power of hydrogen".The "H" is capitalized because it is the hydrogen element symbol. 

Acidic and basic are two extremes that describe a chemical property chemical. The pH scale measures how acidic or basic a substance is. 

pH decreases with an increase in temperature. This does not mean that the water becomes more acidic at higher temperatures.

A solution is considered acidic if there is an excess of hydrogen ions (H) over hydroxide ions (OH^-).

(Refer to image for better understanding)

 ( The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution.)