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Index (F)
FA - FC
FD - FF
FG - FJ
FK - FN
FO - FR
FS - FV
FW - FZ
Moment of truth
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The fastest man-made object that ever leave the Earth is the New Horizon spacecraft, launched in January 2006, and attained a speed of more than 36000 mph. |
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FS - FV
fuel cell Chem.
A voltaic cell that uses hydrogen and oxygen to create electricity via an electrochemical process. It consists of an electrolyte and a porous anode and a cathode. Hydrogen is fed to the anode which then separates
into protons and electrons by catalysis. The protons travel through the electrolyte and electrons travel via an external circuit to reach to cathode.
The notable difference between a fuel cell and a normal battery is that, for the former, the supply of fuel (such as hydrogen) from some external source, in contrast to the limited internal storage capacity of a battery.
fumigation Med.
Use of smoke, gas or vapor to kill microorganisms, mould or pests. This is in contrast to spraying and it does not left any residue.
fumigant Chem., Med.
A substance that is used for fumigation. It is usually a low molecular weight and volatile chemical. For example, methyl bromide (CH3Br) is used to kill woodworm, or formaldehyde
for killing bacteria.
fusion reaction Phys.
A nuclear process whereby two atomic nuclei fuse to form a heavier nucleus with the release of energy. The amount of energy released is depended on the difference of the mass of the final nucleus and the total
mass of the initial nuclei which is given by the Einstein's mass-energy equation E = mc2. Fusion reaction is the main process that powers the Sun and stars. The easiest route to
nuclear fusion involves the isotope nuclei of hydrogen, deuterium and tritium. Even then, extremely high temperature will be needed to produce a plasma to
jump start the reaction, releasing helium-4 nucleus and a neutron.
FS - FV
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