Factor List

1. The B-factor or Debye–Waller factor (DWF), named after Peter Debye and Ivar Waller, is used in condensed matter physics to describe the attenuation of x-ray scattering or coherent neutron scattering caused by thermal motion.It has also been called the B factor or the temperature factor. Often, "Debye-Waller factor" is used as a generic term that comprises the Lamb-Mössbauer factor of incoherent neutron scattering and Mössbauer spectroscopy.
2. The F-factor, in diagnostic radiology, is the conversion factor between exposure and absorbed dose. In other words, it converts between the amount of ionisation in air (roentgens or coulombs/kg) and the absorbed dose in tissue (rads or grays). The Fertility factor (first named F by one of its discoverers Esther Lederberg) allows genes to be transferred from one bacterium carrying the factor to another bacterium lacking the factor by conjugation.

3. The g-factor (also called g value or dimensionless magnetic moment) in Physics is a dimensionless quantity that characterises the magnetic moment and gyromagnetic ratio of an atom, particle or nucleus. It is essentially a proportionality constant that relates the observed magnetic moment μ of a particle to its angular momentum quantum number and a unit of magnetic moment, usually the Bohr magneton or nuclear magneton.

4. The K-factor can refer to many different things but in transportation engineering it refers to the proportion of annual average daily traffic occurring in an hour.

5. The P-factor, also known as asymmetric blade effect and asymmetric disc effect, is an aerodynamic phenomenon experienced by a moving propeller that is responsible for the asymmetrical relocation of the propeller's centre of thrust when an aircraft is at a high angle of attack. This shift in the location of the centre of thrust will exert a yawing moment on the aircraft, causing it to yaw slightly to one side. A rudder input is required to counteract the yawing tendency.

6. The Q Factor of a bicycle is the distance between the pedal attachment points on the crank arms, when measured parallel to the bottom bracket axle.

7. The U-factor or U-value is the overall heat transfer coefficient that describes how well a building element conducts heat or the rate of transfer of heat (in watts) through one square metre of a structure divided by the difference in temperature across the structure.

8. The X-factor is now a hard-to-describe influence or quality; an important element with unknown consequences. Originally it referred to the dangers for people in the military that civilians do not face, for which they receive payment,

9. The Y-factor method is a widely used technique for measuring the gain and noise temperature of an amplifier. It is based on the Johnson-Nyquist noise of a resistor at two different, known temperatures.

10. The Z-factor is a measure of statistical effect size. It has been proposed for use in high-throughput screening (where it is also known as Z-prime and commonly written as Z') to judge whether the response in a particular assay is large enough to warrant further attention.