Ultrasonic nebulizer and method for atomizing liquid

A nebulizer, comprising:

• a housing having a first chamber and a second chamber, the first chamber configured to hold a liquid therein, the second chamber configured to receive the liquid from the first chamber, the second chamber configured to form standing pressure waves therein when the liquid therein is vibrated;
• a piezo-electric device disposed in the second chamber, the piezo-electric device configured to vibrate the liquid in the second chamber such that standing pressure waves are formed in the second chamber;
• and
• a meshed screen disposed at a predetermined distance from the piezo-electric device at a high amplitude region of the standing pressure waves and within a focal region of the piezo-electric device such that liquid in the second reservoir is atomized as the liquid propagates through the meshed screen.