Stay Hydrated and Cool with Vacuum Flasks!

How do vacuum flasks work to keep beverages hot or cold for extended periods of time?

Choose the correct option:

a) By using electricity

b) By creating a near-vacuum that reduces heat transfer

c) By using ice cubes

The Science Behind Vacuum Flasks

The correct answer is: b) By creating a near-vacuum that reduces heat transfer.

Vacuum flasks, also known as Dewar flasks or thermoses, are insulating storage vessels that significantly lengthen the time over which their contents remain hotter or cooler than the surrounding environment. Invented by Sir James Dewar in 1892, these flasks consist of two layers with a vacuum-sealed gap in between. This near-vacuum greatly reduces heat transfer by conduction or convection, keeping beverages at the desired temperature for extended periods.

Whether you're on a hike, at work, or traveling, vacuum flasks are the perfect solution to enjoy your favorite beverages at the ideal temperature. Stay hydrated and cool with the science-backed technology of vacuum flasks!