The term INTENSITY OF SOUND MEASUREMENTS is often measured in decibels (8 letters). Decibels are a unit of measurement used to measure the intensity or loudness of sound. It is a logarithmic scale, meaning that a small increase in decibels can represent a large increase in sound intensity. Decibels are commonly used to measure sound levels in the environment, such as noise pollution, and to measure the volume of sound produced by musical instruments.