While we generally use them to keep our drinks hot, vacuum flasks were invented by James Dewar in 1892 to keep ... he designed a double-walled glass flask and removed the air from the space ...

Wear safety glasses, lab coat, gloves plus any other PPE needed for protection from the potential hazards of the pressurized system (e.g. face shield). Glassware that is etched, cracked, chipped, ...