Table 1.

Physical Properties of Materials Studied (from Refs. [46–50])

Material*	Density (kg/m3)	Compressibility (m2/N)	Viscosity (kg/msec [cP/1000])	Sound Speed (m/sec)	Boiling Point (°C)	Impedance (kg/m2 sec [× 10−6])
Air	1.2	7.0 × 10−6	0.000018	340	−195	0.0004
Perfluoropentane (C5F12)	1660	†	0.00065	471	29	†
Perfluorohexane (C6F14)	1700	2.5 × 10−9	0.00067	520	56	0.88
Water	1000	4.6 × 10−10	0.001	1480	100	1.48

^*Values listed at 20–25°C and 1 atm.

^†Indicates properties not available.