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:The inside of a vacuum flask is usually coated with…The vacuum between the double walls of a thermos…A solid of mass 0.5kg initially at 50oC melts at…The vacuum in a thermoflask reduces heat loss…Tea pots are often silver-coated to prevent heat loss by?