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Sterile water was provided to each culture by capillary action from a 500 ml vacuum flask.
The capacity of the vacuum flask industry is being substantially increased and several new firms are entering it.
Suppose a driver took a vacuum flask to enable him to have a hot meal during the journey.
He dealt with certain kinds of thermos flasks, and instances could be given of other types of vacuum flask, showing the game that has been played.
I confess that it is conceivable but not particularly likely that it may contain a soft drink instead, in which case it is no worse than a vacuum flask.
A typical domestic vacuum flask will keep liquid cool for about 24 hours and warm for up to 8.
The insulation of the vacuum flask results in a very slow boil and thus the contents remain liquid for long periods without refrigeration equipment.
An early 1919 high-altitude oxygen system used a vacuum flask of liquid oxygen to supply two people for one hour at.
It is then sealed inside the vacuum flask for several hours.
A removable pot, with handle and lid, fits inside the 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.
It is cooked inside a vacuum flask.
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.
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 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.
