
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.

constant
Happening steadily and without interruption; ongoing.
Der konstante Lärm von der Baustelle ist sehr störend.
The constant noise from the construction site is very disruptive.
'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.
steady / continuous
Konstant and stetig can describe an even progression. Konstant emphasizes that a value remains unchanged over a longer period of time. Stetig describes a continuous progression without major fluctuations and can also express regular change. Konstant therefore fits a fixed value, while stetig fits ongoing development.

Die Temperatur blieb den ganzen Vormittag konstant bei 20 Grad.
The temperature remained constant at 20 degrees all morning.
Die Temperatur stieg den ganzen Vormittag stetig von 15 auf 20 Grad.
The temperature rose steadily from 15 to 20 degrees all morning.