Table 1.

Power densities of low frequency (20 kHz) and high frequency (850 kHz) systems.

Equipment	US amplitude (%)	US Mode	Volume (mL)	Power density (W/mL)
20 kHz Probe	20%	continuous	200	0.15
	30%	continuous	200	0.23
	40%	continuous	200	0.30
850 kHz Reactor	25%	continuous	200	0.02
	50%	continuous	200	0.03
	75%	continuous	200	0.12
850 kHz Reactor	75%	Pulse (1:5)	200	0.014
	75%	Pulse (5:1)	200	0.029