Ultrasound definition
First, it is important to understand the definition of sound. Let's see two
definitions of sound:
- Simple definition: Sound is the perception of vibrations stimulating the ear
- Scientific definition of sound: sound is a periodic disturbance in fluids
density, or in the elastic strain of a solid, generated by a vibrating object.
These waves (vibrations) propagate in two basic ways: longitudinal waves and
transverse waves.
Simple ultrasound definition
Ultrasound is sound with a frequency over 20,000 Hz, which is about the upper
limit of human hearing. Human beings cannot hear ultrasound |