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chronometer.
stopur.
Last Update: 2014-10-18
Usage Frequency: 2
Quality:
as soon as the ph meter reads 8,3, start the chronometer and add the sodium hydroxide solution drop by drop at a rate which maintains the ph at 8,3.
når ph-meteret viser et ph på 8,3, startes stopuret, og der tilsættes dråbevis så meget natriumhydroxidopløsning, at ph holdes på 8,3.
within five seconds of completion of discharge, apply the source of ignition to the edge of the sample at its base and at the same time start the chronometer (stopwatch).
senest 5 sekunder efter udtømningen anbringes antændelseskilden mod prøvematerialets side ved bunden, og samtidig startes stopuret.