It seems like I can have ice cold water for 12+ hours in my yeti, but a glass of water will reach room temperate in a matter of a few hours
In: Engineering
The inside of the Yeti is actually a vacuum. So the only way for heat to enter is through the lip of the bottle or the surface of the water. That’s a lot less than the entire surface of a regular glass, so it holds its temperature longer.
Insulation. A glass of water gains heat via direct conduction from the liquid to the air at the top and from the liquid to the glass to the air at the sides. A vacuum insulated flask like a Yeti bottle has two walls with a vacuum between them. There is nothing in the vacuum to conduct heat and so heat transfer is very slow, only being possible through radiation or conduction at the top where the two walls are connected.
Couple of factors, but primarily theres a vacuum sealed stainless steel, and a couple of other metals that conduct heat poorly built between where your drink is, and where ambient temperature is on the outside.
The worse the metals conduct heat, the longer it takes for outside temperatures to affect your inside temperatures.
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