Question

The vacuum between the walls of the flask prevents the transfer of heat by

• A. Conduction
• B. Convection
• C. Radiation
• D. All

Answer 1

The correct option is A Conduction

Thermos flask is a special kind of bottle used for keeping the hot liquid hot and the cold liquid cool for a sufficiently long time. It was deviced by sir James Dewar and do it is also known as Dewar Flask. The vacuum between the walls of the flask prevents the transfer of heat by conduction.