Question

What is thermo flask ?
Draw a diagram to show it.

Answer 1

Answer:

Heat transfer is minimized because of:

1. The vacuum between the two walls, rubber, glass, cork and air do not allow the loss of heat by conduction.

2. Cork in the neck of flask and the cup over it prevent loss of heat by convection.

3. Heat cannot be lost by conduction or convection because of vacuum between the two walls.

4. Heat loss is also minimized by radiation, by making outer surface of inner wall and inner surface of outer wall silvered. The inner wall is a bad radiator and the outer wall is a good reflector of radiation.

Answer 2

Explanation:

A vacuum flask 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. Wikipedia

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