21. It is cooked inside a vacuum flask . 22. The word " thermos " is a genericized trademark used as a name for a vacuum flask . 23. The layers of the sunshield provide and insulating layer like a vacuum flask or double layer coffee cup. 24. Vacuum flasks are at risk of implosion hazard and glass vessels under vacuum in particular may shatter unexpectedly.25. Hydrogen was liquefied by James Dewar in 1898 by using regenerative cooling and his invention, the vacuum flask . 26. Corser would take a train to Bologna, a two-and-a-half-hour ride, with his washed semen in a vacuum flask . 27. As of 2009, they still sell vacuum flasks and other thermal products manufactured under contract with the Aladdin name. 28. Someone drops an open vacuum flask of sarin nerve gas in a trash can near the airport check-in counter. 29. "' Sir James Dewar "'vacuum flask , which he used in conjunction with extensive research into the liquefaction of gases. 30. :Do you mean vacuum flasks ?
