Sentence examples for this is a known amount from inspiring English sources

Present value: This is a known amount that you are drawing payments from, as with loans and some retirement instruments.

In this method, the metabolic system is administered a known amount of an isotopically labeled substrate (such as glucose labeled with C at specific atom positions).

See how much of a substance with a known half life is left after a known amount of days.

Camera sensitivity was measured using a known amount of 99mTc [25].

The ability of removing bacteria by the composites was investigated using a known amount of E. coli bacterial suspension.

The standard curve of ATP concentration was prepared from a known amount (1 nM–10  μM).

The concentration of haemoglobin was calculated from a known amount of haemoglobin assayed in parallel.

Blank organism samples were spiked with a known amount of parent compound at the beginning of the extraction method.

Rigorous measures must be undertaken to ensure that the reagents and vessels used do not themselves supply the element, but this is easily controlled by chemically processing a known amount of the spike alone and determining the amount of the element picked up.

Ganglioside concentrations were calculated by ratio against a known amount of extracted deuterated ganglioside internal standard.

The background activity concentration was prepared using several syringes with a known amount of 18F activity.