Advertisement Remove all ads

Draw a labeled diagram of a vacuum flask and explain how the heat transfer minimized in it. - Physics

Short Note
Draw a labeled diagram of a vacuum flask and explain how the heat transfer minimized in it.
Advertisement Remove all ads

Solution

The flask consists of a double-walled glass container with a vacuum between the walls A and B. The inner side of A and the outer side of B are silvered. It has a narrow mouth which is closed by a non-conducting rubber stopper.
If a hot liquid is placed inside the flask, it cannot lose heat by conduction or convection, as there is no air between the walls. The small amount of heat lost from the liquid by radiation is reflected back into the liquid by silvering of the inner wall A and any radiation striking the outer wall B, is reflected back and prevented from reaching the liquid.

Concept: Temperature
  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

Frank Class 9 Physics ICSE
Chapter 5 Heat
Transmission of Heat | Q 23 | Page 227
Advertisement Remove all ads
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×