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  2. The 12 Best Cool-Mist Humidifiers That Will Become the Unsung ...

    www.aol.com/12-best-cool-mist-humidifiers...

    Amazon. ATTN: Allergy sufferers. This Levoit humidifier has a 360-degree rotating nozzle that spreads an ultra-fine cool mist into the air for fast relief from allergens.

  3. Humidifier - Wikipedia

    en.wikipedia.org/wiki/Humidifier

    An ultrasonic humidifier uses a ceramic diaphragm vibrating at an ultrasonic frequency to create water droplets that silently exit the humidifier in the form of cool fog. Usually the mist gets forced out by a tiny fan, while some ultra mini models have no fans.

  4. South Korean humidifier disinfectant case - Wikipedia

    en.wikipedia.org/wiki/South_Korean_humidifier...

    On November 11, 2011, six humidifier disinfectants which contain PHMG and PGH were recovered. PHMG and PGH was banned in 2011, and new cases ceased occurring. [1] [2] However, later on, the Korea Centers for Disease Control and Prevention did not find a causal relationship that CMIT and MIT in humidifier disinfectants cause pulmonary fibrosis.

  5. Ultrasonic flow meter - Wikipedia

    en.wikipedia.org/wiki/Ultrasonic_flow_meter

    Schematic view of a flow sensor. An ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. Using ultrasonic transducers, the flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and ...

  6. Ultrasonic cleaning - Wikipedia

    en.wikipedia.org/wiki/Ultrasonic_cleaning

    Ultrasonic cleaning is a process that uses ultrasound (usually from 20 to 40 kHz) to agitate a fluid, with a cleaning effect. Ultrasonic cleaners come in a variety of sizes, from small desktop units with an internal volume of less than 0.5 litres (0.13 US gal), to large industrial units with volumes approaching 1,000 litres (260 US gal).

  7. Ultrapure water - Wikipedia

    en.wikipedia.org/wiki/Ultrapure_water

    Ultrapure water (UPW), high-purity water or highly purified water (HPW) is water that has been purified to uncommonly stringent specifications. Ultrapure water is a term commonly used in manufacturing to emphasize the fact that the water is treated to the highest levels of purity for all contaminant types, including: organic and inorganic compounds; dissolved and particulate matter; volatile ...