Ever wonder how our stainless steel tumblers, bottles, and food containers keep your drinks icy cold during the summer months and your coffee and soups piping hot during the coldest days of the winter? Is it magic? No, it's a science. All our insulated stainless steel vessels (tumblers, bottles, and food containers) are double-walled. What does that mean? We're glad you asked. Double wall insulation is exactly what it sounds like; a container with two walls separating the contents of the tumbler and your hand. Double wall insulation by itself is also not ideal for hot drinks as the heat transfers to the outside of the tumbler, which leaves your drink, not the temperature you wanted. What makes our vacuum-insulated tumblers superior to a standard tumbler is the vacuum insulation.
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Vacuum Insulation
Vacuum insulation was first used in food containers to keep food stored inside the container hot for hours. The space between the two stainless steel tumbler walls has all the air removed. This creates a void similar to outer space. In this area, heat isn't transferred by conduction or convection which gives our tumblers superior insulation when compared to a standard cup.
What is conduction and convection heat transfer? Heat conduction takes place when two objects (such as a heating element and a pot) are touching. The heat from the object of higher temperature is transferred to the object of lower temperature. For example, the heat from a hot heating element is transferred to a pot with cool water that is placed on top of it allowing the heat to transfer from the element to the water.
Convection occurs when fluids (liquids or gases) are heated or cooled from being exposed to an external source and move from one location to another. Colder fluids replace the space that the heated fluids left, and the cycle continues.
HOW INSULATED TUMBLERS KEEP DRINKS HOT
After our premium stainless steel vacuum-insulated tumbler is filled up with a hot drink and the lid is sealed tightly, the three methods of heat transfer to and from the drink are eliminated. The loss of heat through conduction is eliminated by the double-walled structure separated by the vacuum layer seeing as no external object can touch the liquid or the layer of wall touching the hot liquid. Heat convection is prevented by the double-wall vacuum layer because external air can not come into contact with the hot liquids from the sides. A snug-fitting lid also prevents hot air from escaping and convection from cooler currents from coming in.
HOW INSULATED TUMBLERS WORK ON A COLD DRINK
When a cold drink is poured into a Chilly Moose premium-insulated stainless steel double-wall vacuum-insulated tumbler, the same process happens in reverse. Instead of preventing heat from transferring from hot liquids, it prevents external heat from being transferred into cold liquids. External heat transferred by conduction is prevented by the double wall vacuum insulation as minimal heat can transfer heat into the cold drink. Transfer of external heat by convection is minimized by the lid and vacuum-sealed construction because minimal external heated air can transfer energy into cold beverages.
