The science of 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!

About Cognitive Surplus

Science Meets Design — Founded in 2013 by Kristen and Geoff in a small New York City apartment, Cognitive Surplus was born out of a desire to celebrate the beauty of science through thoughtful design. Now based in the high desert of Central Oregon, this minority woman-owned small business creates sustainable goods intended to inspire discovery and wonder. Deeply committed to social and environmental responsibility, Cognitive Surplus maintains an inclusive workplace that provides meaningful employment for adults with disabilities and operates with a focus on sustainability in both their products and their energy use.

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