Flask is a British unit of mass or weight in the avoirdupois system, used to measure mercury. It is defined as . Near room temperature, a flask of mercury occupies a volume of approximately .At 20°C/ 68°F listed density of 13545 kg/m3 = 13.545 kg/L (14.1298 oz/fl oz (US))
Conversion 1 flask (mercury) ≡ 76 lb
1 flask (mercury) ≡ 34.47302012 kg
References