![]() ![]() When that gas comes in contact with a cold cup it turns from gas into a liquid and sticks to your cup. Warm air (whether it be outside or inside) is full of water in the form of gas. You likely learned about this in school but totally fine if you’ve forgotten how this works (I did) so let me explain it. Regular cups sweat because of condensation. The outside of the Yeti and RTIC cups however stayed at room temperature and didn’t seem to cool down at all. In fact when I took the temperature of the outside of the cups I could clearly see the glass, plastic and kids stainless steel cups exterior had dropped in temperature close to that of the iced water. ![]() Shortly after the plastic cup also began to sweat.īut throughout the entire test neither the Yeti Tumbler nor the RTIC Tumbler cup showed any signs of sweating. Very quickly, within a minute, the glass and stainless steel kids cups began to sweat. I then left them on my office table while I was writing this article (literally I’m writing this right now as they sit there) Kids Stainless Steel Cup (not double walled).To test this out I filled up 5 different cups with ice and tap water and filled them about 3/4 full so we can clearly see any condensation lines. What this means that that when you put an iced beverage in your Yeti cup the inside walls get really cold, but the outside walls of the cup stay at room temperature.īecause the outside walls of the cup stay at room temperature this does not cause the moisture in the air to condensate and stick to the walls thus the cups don’t sweat. Stainless steel is also a terrible insulator of heat. In between the inner and outer wall is a vacuum which lets little to no heat through it. Yeti tumbler cups are made of double walled stainless steel. This causes the moisture in the air to change from a gas to a liquid form, sticking to the cup.īut in order for this to happen the exterior of the cup needs to be colder than room temperature. Why Don’t Yeti Rambler Cups Sweat?Ĭups sweat when the cold outside of the cup comes into contact with the warm moisture in the air. I tested the Yeti cups myself and proved that while glass, plastic and non-insulated stainless steel cups all sweat and get wet, the Yeti tumbler cups don't. Because Yeti cups have a vacuum sealed gap the outside doesn’t get cold but rather stays at room temperature and thus doesn’t cause condensation. Cups sweat due to the beverage making the outside of the cup cold, causing condensation. Yeti Tumbler Cups don’t sweat when filled with cold beverages or hot beverages. But do Yeti Tumbler Cups sweat and if not, why don’t they sweat? Most stainless steel or glass cups sweat when filled with cold or iced beverages. ![]()
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