Tea Chemistry Stainless Steel Vacuum Flask 500 ml

Modern science has revealed what people all around the world have known for centuries – tea is amazing! In addition to keeping your earl gray piping hot or your iced chai cool and refreshing, this double-walled flask celebrates the complex array of molecules that give tea its unique qualities and flavors. Molecules such as theaflavin, which adds bitterness to black tea – or L-theanine, which alters your brain waves to promote relaxation.

With a textured design for a unique tactile experience, this flask will keep your drink hot or cold until you're ready to enjoy it.

Details:
Volume: 500 mL
Width: 7 cm
Height: 22,5 cm
Opening: Wide mouth
Material: High-grade stainless steel
Cap Material: High-grade stainless steel, silicone ring
Care: Hand wash (do not wash in dishwasher)

Fill it with your favorite mulled hot cider or cold brew, and even if you don't get around to drinking it for hours, you can expect to find your beverage ready and waiting for you at just the right temperature. The metal cap seals tightly, so it won't leak all over your bag. 

The science:
Here's how it works: the space between the inner and outer flask wall is evacuated, creating a vacuum (well, a partial vacuum anyway...). In order for heat transfer to take place from the outside world into your cold drink, or from your hot drink to the outside world, it needs nearby molecules to excite. If there aren't many molecules nearby, as is the case in a vacuum, the heat's energy can't easily be passed along, so your drink stays close to the temperature it was when you put it into the flask for a really long time. 

Simply stated, vacuums make great thermal insulation!