The phrase "appreciable fraction of" is correct and usable in written English.
It can be used when discussing a significant or noticeable portion of something, often in quantitative contexts.
Example: "An appreciable fraction of the population has expressed concern about climate change."
Alternatives: "significant portion of" or "notable share of".
(That sounds small, but it's an appreciable fraction of the national average retail price of a kilowatt-hour, which is around 11 cents).
Foreign residents constitute a small but appreciable fraction of the populace; they are not concentrated in any particular areas but are distributed across the city.
Bead lightning is most apparent when the current in a cloud-to-ground flash persists for an appreciable fraction of a second.
In a "closed" universe, the beams eventually cross; in an "open" universe, they spread apart.The difficulty with testing this by experiment is that the light beams must traverse an appreciable fraction of the universe before the deviations become significant.
The theoretical work of Professor Bethe in the United States and experimental work carried out in the United Kingdom has suggested that a temperature as low as 50,000 degrees centigrade might be sufficient to burn up an appreciable fraction of the explosive mixture.
Removing the President is a dramatic move against the popular will; in effect, Nadler said, "you are nullifying the last election," which is not something to be undertaken "without having buy-in, at least by the end of the process, by an appreciable fraction" of Republicans as well as Democrats.
For heavy charged particles with high initial velocities (those that are appreciable fractions of the speed of light), large-angle scatterings are rare.
This absence of data prevents modeling and simulation communities from predicting performance of uranium silicide fuels that are either nominally USi itself, or are designed with other uranium silicide phases but may include appreciable fractions of USi introduced as a result of the fuel synthesis or fabrication process.
In most cases, this energy Eg is dissipated as heat, but in gallium phosphide and especially in gallium arsenide, an appreciable fraction appears as radiation, the frequency ν of which satisfies the relation hν = Eg. In gallium arsenide, though up to 30 percent of the input electric energy is available as radiation, the characteristic wavelength of 900 nanometres is in the infrared.
TEs can constitute an appreciable fraction in the genome and are found in most species with the exception of liverwort [ 33].
The vast majority of cones imaged at 1.5° and 3° retinal eccentricity and a smaller but still appreciable fraction at 6° retinal eccentricity generated two distinct reflections that straddled the cone OS, one at the IS/OS junction and the other at the OS posterior tip.
