0 a container with double walls that have a vacuum between them to keep the contents from losing or gaining heat -- phích, bình téc mốt
A plain glass cylinder may be used, or a vacuum flask arrangement to keep the coffee hot; this is not to be confused with a vacuum brewersee below.
The liquid air, which takes up one-thousandth of the volume of the gas, can be kept for a long time in a large vacuum flask at atmospheric pressure.
A slow cooker allows any desired cooking time; the more energy-efficient vacuum flask must cook within the time taken for the food to cool below cooking temperature.
It is cooked inside a vacuum flask.
Place the filter holder on a vacuum flask and then place another filter on top of the filter holder by using a pair of tweezers.
A removable pot, with handle and lid, fits inside the vacuum flask.
It is then sealed inside the vacuum flask for several hours.
An early 1919 high-altitude oxygen system used a vacuum flask of liquid oxygen to supply two people for one hour at.
