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  2. Quiet PC - Wikipedia

    en.wikipedia.org/wiki/Quiet_PC

    A 120 mm variable speed fan. If they use fans at all, quiet PCs typically use larger-than-usual low-speed fans with quiet-running motors and bearings. The 120 mm size is common, and 140 mm fans are used where cases or heat sinks allow them. Quiet fan manufacturers include Nexus, EBM-Papst, [30] Yate Loon, Scythe, [31] and Noctua. [32]

  3. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    While 1 atm (194 dB peak or 191 dB SPL) [11] [12] is the largest pressure variation an undistorted sound wave can have in Earth's atmosphere (i. e., if the thermodynamic properties of the air are disregarded; in reality, the sound waves become progressively non-linear starting over 150 dB), larger sound waves can be present in other atmospheres ...

  4. Long-range acoustic device - Wikipedia

    en.wikipedia.org/wiki/Long-range_acoustic_device

    Acoustic hailing devices have an output of 135 decibels (dB) or greater. The acoustic level of the source is commonly expressed in terms of Sound Pressure Level or SPL. SPL is a logarithmic measure of the rms sound pressure of a sound relative to a reference value. It is measured in decibels (dB) above a standard reference level. For reference ...

  5. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Sound level meter - Wikipedia

    en.wikipedia.org/wiki/Sound_level_meter

    For compliance purposes, readings with an ANSI Type 2 sound level meter and dosimeter are considered to have an accuracy of ±2 dBA, while a Type 1 instrument has an accuracy of ±1 dBA. A Type 2 meter is the minimum requirement by OSHA for noise measurements and is usually sufficient for general-purpose noise surveys.

  7. Ducted fan - Wikipedia

    en.wikipedia.org/wiki/Ducted_fan

    In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller . [ 1 ] When used in vertical takeoff and landing ( VTOL ) applications it is also known as a shrouded rotor .

  8. 17 Easy & Cozy Breakfasts for Winter - AOL

    www.aol.com/17-easy-cozy-breakfasts-winter...

    Skip the gluten and get some vitamin C with this healthy sweet potato toast recipe. Topped with spinach, egg and a dash of hot sauce, it's a delicious alternative to eggs Benedict.

  9. Florida sues FEMA, alleging discrimination against Trump ...

    www.aol.com/news/florida-sues-fema-alleging...

    Florida's attorney general said on Thursday she filed a lawsuit against the U.S. Federal Emergency Management Agency for allegedly discriminating against hurricane victims who supported President ...