konstant
constant
Remaining the same and unchanged over a longer period of time.
Die Temperatur im Raum wird konstant auf 21 Grad gehalten.
The temperature in the room is kept constant at 21 degrees.

constant
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constant
Remaining the same and unchanged over a longer period of time.
Die Temperatur im Raum wird konstant auf 21 Grad gehalten.
The temperature in the room is kept constant at 21 degrees.

'Konstant' is very often used as an adverb to modify a verb. It then means 'uninterruptedly' or 'steadily'.
Seit dem Unfall leidet er konstant unter Schmerzen.
Since the accident, he has been in constant pain.
In the meaning of 'gleichbleibend' (remaining the same), 'konstant' is often combined with measurable quantities. Typical examples are 'konstante Temperatur' (constant temperature), 'konstanter Druck' (constant pressure), 'konstanter Wert' (constant value), or 'konstantes Niveau' (constant level).
Für das Experiment ist ein konstanter Druck erforderlich.
Constant pressure is required for the experiment.
In the meaning of 'andauernd' (ongoing), 'konstant' often describes annoying or persistent phenomena. Common combinations are 'konstanter Lärm' (constant noise), 'konstanter Regen' (constant rain), or 'konstante Kritik' (constant criticism).
Der konstante Regen drückte auf die Stimmung.
The constant rain dampened the mood.
eternal / ages
'ewig' and 'konstant' can both describe something staying the same. 'ewig' sounds stronger and often more emotional: you imagine something as unchanging or always the same. 'konstant' is more factual and more precise, especially with numbers, performance, temperatures, or states. 'ewig' fits better when you perceive something as always happening the same way, or when you are exaggerating. 'konstant' fits better when you want to say neutrally that something does not change over a longer period of time.

Die Temperatur im Raum blieb den ganzen Tag konstant.
The temperature in the room stayed constant all day.
Sarah hat ihre ewigen Ausreden langsam satt.
Sarah is slowly getting fed up with her perpetual excuses.