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  2. Hydrogen fluoride - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_fluoride

    Hydrogen fluoride does not boil until 20 °C in contrast to the heavier hydrogen halides, which boil between −85 °C (−120 °F) and −35 °C (−30 °F). [6] [7] [8] This hydrogen bonding between HF molecules gives rise to high viscosity in the liquid phase and lower than expected pressure in the gas phase.

  3. High frequency - Wikipedia

    en.wikipedia.org/wiki/High_frequency

    High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).

  4. HF - Wikipedia

    en.wikipedia.org/wiki/HF

    Hafnium, symbol Hf, a chemical element; Hartree–Fock method, a calculation scheme in the field of computational chemistry; Hydrogen fluoride, HF, a diatomic compound which can dissolve in water to form hydrofluoric acid, a highly corrosive solution; Hydrofluoric acid, HF (aq), a solution of hydrogen fluoride (HF) in water

  5. Hydrofluoric acid - Wikipedia

    en.wikipedia.org/wiki/Hydrofluoric_acid

    Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water.Solutions of HF are colorless, acidic and highly corrosive.A common concentration is 49% (48-52%) but there are also stronger solutions (e.g. 70%) and pure HF has a boiling point near room temperature.

  6. List of medical abbreviations: H - Wikipedia

    en.wikipedia.org/wiki/List_of_medical...

    HF: heart failure: HFpEF: heart failure with preserved ejection fraction: HFrEF: heart failure with reduced ejection fraction HFM: hand, foot and mouth disease: HFMD: hand, foot and mouth disease: HFNC: high flow Nasal cannula: HFRS: hemorrhagic fever with renal syndrome HGB: hemoglobin: HGH Human Growth Hormone: HGSIL: high-grade squamous ...

  7. HuffPost Data

    data.huffingtonpost.com

    HuffPost Data Visualization, analysis, interactive maps and real-time graphics. Browse, copy and fork our open-source software.; Remix thousands of aggregated polling results.

  8. List of military electronics of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_military...

    Survival radio, operates in Very High Frequency (VHF) and Ultra high frequency (UHF) aircraft bands. Replaced by AN/PRC-149: AN/PRC-113: Portable Very High Frequency (VHF)/Ultra high frequency (UHF) AM combat radio transceiver: Magnavox: AN/PRC-117: Falcon® portable, tactical software-defined combat-net radio: Harris Corporation (now L3Harris ...

  9. WWV (radio station) - Wikipedia

    en.wikipedia.org/wiki/WWV_(radio_station)

    WWV Transmitter Building (2002 or earlier) WWV's 15 MHz antenna WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado.It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, 20, and 25 MHz. [1]

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