General

time constant

2.75  relaxation time; time constant.

relaxation time

2.75  relaxation time; time constant.

sound-power density

2.70  sound intensity; sound-energy flux density; sound-power density.

sound-energy flux density

2.70  sound intensity; sound-energy flux density; sound-power density.  

sound intensity

2.70  sound intensity; sound-energy flux density; sound-power density.