Figure 15-33.-Data sheet for specific gravity test.6. Attach a vacuum pump to the flask andan alternative to theexhaust all air. The exhausted air is indicatedmay be exhausted byby rising bubbles. For most soils, 30 minpension forof pumping is enough. A heavy clay, however,removal ofmay require as much as 2 hr of pumping. Asthe flask. A15-27vacuum pump, the airgently boiling theat least 10 min. To aid inentrapped air, occasionallyslow boil should be used, assus-therollfast
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