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Discover LudwigThe word 'momentaneous' is a valid English word and can be used in written language.
It means lasting for a very short time or an instant. It is not a commonly used word, but it can be used to add variety to one's vocabulary. Example: The momentaneous flash of lightning lit up the dark sky for a split second before disappearing without a trace.
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Substituting the momentaneous inlet oxygen concentration for the filtered concentration in the standard gas balance equations resulted in favourable dynamic characteristics and high steady-state accuracy.
The ratio of momentaneous frequency versus CF as a function of time, measured in periods of CF. The parameters are α = − 5.3 π, β = 16 π and c = 32 π.
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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