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Discover LudwigThe phrase "a certain amount of mass" is correct and usable in written English.
It can be used in scientific contexts or discussions where you want to refer to an unspecified quantity of mass.
Example: "In this experiment, we need to measure a certain amount of mass to ensure accurate results."
Alternatives: "a specific quantity of mass" or "an unspecified mass".
Exact(3)
"Your body is built to carry a certain amount of mass," said Pat Gillick, general manager for the Seattle Mariners.
When you have a certain amount of mass, you experience a certain amount of gravitational attraction towards that mass: this is equally true in both Einstein's and Newton's theory of gravity.
He learns about 'hydrophobic core' and its immense importance in making the primary sequence fold the way it does[4], but a mapping between exact amount of hydrophobicity necessary to make a certain amount of mass fold in any of the SCOP(Structural Classification of Proteins) classes, remains elusive to him.
Similar(57)
That last point is important: if I have two black holes of equal mass, their event horizons take up a certain amount of volume in space.
A molecular cloud of gas with a certain amount of enrichment — containing about 2% heavy elements by mass, along with ~28% helium and ~70% hydrogen — collapsed, giving rise to new stars.
A certain amount of weight is transferred laterally from the backfill to the rock mass.
Those interactions give each type of particle a certain amount of energy and, thanks to Einstein's famous equation E = mc2, mass.
A certain amount of sigh in it.
But a certain amount of unease remains.
There is a certain amount of selling.
A certain amount of it is automated.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com