A nebulizer is a type of machine that involves a compressor which turns a liquid into a mist which can then be inhaled into the lungs. Certain types of asthma medicines, including inhaled corticosteroids, or short-acting or long-acting bronchodilators, can be given by a nebulizer machine.Nebulizers use oxygen, compressed air or ultrasonic power to break up medical solutions and suspensions into small aerosol droplets that can be directly inhaled from the mouthpiece of the device. The definition of an aerosol is a "mixture of gas and liquid particles," and the best example of a naturally occurring aerosol is mist, formed when small vaporized water particles mixed with hot ambient air are cooled down and condense into a fine cloud of visible airborne water droplets.