What is HF?

  • (noun): A gray tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons.
    Synonyms: hafnium, atomic number 72
    See also — Additional definitions below


HF, Hf or hf can refer to:

Read more about Hf.

Some articles on HF:

Swansea Magpies - 2011 Squad
... Position Name Nationality HF Matt Keygan Australia HF Tim Atkins England HF Jack Williamson Wales HF Tim Walkden England M M ...
Sabatier Principle
... In this case, the heat of formation (ΔHf) of the metal formate salt was used for the x axis because studies showed that the reaction intermediate was a surface formate ... At low values of ΔHf, the reaction is slow (in other words, requires higher temperatures) because the rate of adsorption is slow and rate-limiting ... At high values of ΔHf, desorption becomes the rate-limiting step ...
List Of Amateur Radio Frequency Bands In India - Licence Categories - Grade II
... Power (W) 6 1.820–1.860 160 m MF A1A, A2A, A3E, H3E, J3E, R3E 7. 3.500–3.700 80 m HF A1A, A2A, A3E, H3E, J3E, R3E 7. 3.890–3.900 80 m HF A1A, A2A, A3E, H3E, J3E, R3E 7. 7.000–7.100 40 m HF A1A ...
Langkær Gymnasium & HF
... Langkær Gymnasium HF is a school for youth education in the suburb Tilst, 6 km west of Århus ... high school exam (3 years) and the shorter HF-exam (2 years) ...
List Of Amateur Radio Frequency Bands In India - Allotted Spectrum
700180000000000000080 m HF 7 70033890000000000003.890–3.900 700180000000000000080 m HF 7 70037000000000000007.000–7.100 700140000000000000040 m HF 7 ...

More definitions of "HF":