Question

Explain why, a substance semains wn the temperature in a thermos flash bottle ? the same ar Vacuum​

Answer 1

Answer:

A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.

Answer 2

Answer:

A flask or a thermos keeps hot liquids hot and cold liquids cold. ... The basic principle behind the working of a flask is to insulate the substance from the outside air so that no heat transfer takes place. When there is no heat transfer, the temperature of the substance remains the same