Sentence:  Volatiles of "kecap manis" and its raw materials were extracted using Likens-Nickerson apparatus with diethyl ether as the extraction solvent. The extracts were then dried with anhydrous sodium sulfate, concentrated using a rotary evaporator followed by flushing using nitrogen until the <WSD>volume</WSD> was about 0.5 ml. 
Meaning of the word marked with <WSD> tags:  A three-dimensional measure of space that comprises a length, a width and a height. It is measured in units of cubic centimeters in metric, cubic inches or cubic feet in English measurement.