Chill the water in two plastic bottles (for example, in the refrigerator). Then take out the bottles, put one of them on the table

Chill the water in two plastic bottles (for example, in the refrigerator). Then take out the bottles, put one of them on the table, and wrap the other in a warm blanket. Check after a while: has the “warm” blanket warmed the water in the bottle? Draw a conclusion from your experience.

An unwrapped bottle will heat up by taking in heat from the environment. A bottle wrapped in a blanket will remain cold, since the blanket contains air between its own curtains, which is a poor conductor of heat, so heat will not flow to the bottle.