Question

how does pressure, density, buoyancy, etc, apply to the gases and liquids used as a sonogram tech?

Answer 1

A Transducer emits sound waves at different frequencies. In turn, the sound waves are reflected back to the transducer after they bounce off the structures that are the focus of the sonography The central processing unit measures the echo intensities and speed. This is the basic principle of sonogram technology.

Now, The speed of sound depends on the elasticity and density of the medium through which it is traveling. In general, sound travels faster in liquids than in gases and faster in solids than in liquids. Diffrence between the intensities and distance of the echoes can tell about the object properties and object's image is formed by the sonogram machine by studying these echoes.