The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by? by Sunday | Nov 16 | Physics JAMB | 0 comments A. convection B. conduction C. radiation D. evaporation Correct Answer: Option A – convection Users Also Read These:Which of the following factors should be considered…Ice of mass 10g at 5ºC was completely converted to…In a thermos flask, heat loss by radiation is…A solid of mass 0.5kg initially at 50oC melts at…The main reason for establishing game reserves is to…