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The flask has a double wall, with no air between the two walls (vacuum)- conduction. The walls are highly reflective silver- radiation. the flask has a small beck that is closed by a stopper or cap-convection.

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How does a tight fitting plastic stopper on a flask minimise heat transfer?

It prevents heat transfer by convection as it prevents contact between the surrounding air and air inside the flask. It prevents heat transfer by conduction as it is a poor conductor of heat.


How does a double-walled glass container cut down on heat loss?

A double-walled glass container creates a layer of insulation between the two walls, reducing heat transfer through conduction and convection. This helps to maintain the temperature of the contents inside the container for a longer period of time compared to a single-walled container.


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Silver coating on glass walls reduces heat transfer by reflecting thermal energy away from the surface, rather than absorbing it. This helps to keep the interior of the building cooler by preventing heat from transferring into the space. Additionally, the silver coating can also act as a barrier to block infrared radiation, further reducing heat transfer.


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