A insulated bottle keeps coffee hot by?

An insulated bottle keeps coffee hot by minimizing heat transfer to the surrounding environment. Here's how it works:

* Vacuum Insulation: The most common type of insulation uses a vacuum between the inner and outer walls of the bottle. This vacuum eliminates air, which is a good conductor of heat. Without air to carry heat away, the coffee stays hot for longer.

* Double-Walled Construction: The bottle is typically made of two layers of stainless steel or glass, with a vacuum between them. This creates a barrier to heat transfer.

* Reflective Coating: The inner layer of the bottle often has a reflective coating, usually made of silver or another highly reflective material. This coating reflects radiant heat back towards the coffee, preventing it from escaping.

* Insulated Lid: A tight-fitting, insulated lid further reduces heat loss through the opening of the bottle.

By combining these features, insulated bottles significantly slow down the rate at which heat escapes from the coffee, keeping it hot for several hours.