The phrase "a definite amount" is correct and usable in written English.
It can be used when specifying a precise quantity or measurement of something.
Example: "The recipe calls for a definite amount of sugar to achieve the desired sweetness."
Alternatives: "a specific quantity" or "an exact amount".
A definite amount of energy is required to reverse such a magnet.
Some people might need a definite amount of infinite time, while others might need an infinite amount of definite time.
The key concept is that heat is a form of energy corresponding to a definite amount of mechanical work.
I would like to see the term bandwidth restricted to the one case where it is appropriate: when a signal is encoded and modulated as a specific wave form and therefore occupies a definite amount of frequency spectrum.
Determination of the very small quantities of radium contained in a few grams of a mineral, or a few litres of mineral water, is made by measuring the quantity of radon it produces in a definite amount of time.
That is to say, Faraday demonstrated that it takes a definite amount of charge to convert an ion of an element into an atom of the element and that the amount of charge depends on the element used.
Ten months after the operation function was as follows: complete extension (Fig. 8), flexion to 90 degrees (Fig. 9), and a perfectly definite amount of abduction (Fig. 10).
A stock solution of Cu II) (1000 mg/L) was prepared by dissolving definite amount of CuSO4·5H2O (AR grade, MERCK) in distilled water.
Moreover, inverter should also be capable to inject definite amount of reactive power into the grid, as demanded by the international regulations.
Hydrochloric acid (20 wt%) was heated to 100 °C and definite amount of gypsum was added.
Ground sal flower petal was mixed thoroughly with definite amount of calcium chloride.
