Question

A vacuum flask is able to keep cold liquid cold because it (i) decreases the rate at which heat flows into the liquid (ii) decreases the rate at which heat flow out of the liquid​

Answer 1

Answer:

1st is the answer

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Answer 2

ii) decreases the rate at which heat flows out of the liquid.

• Heat can't escape from a vacuum flask.
• Heat cannot penetrate from outside either.
• The sealed stopper stops the entering heat via convection.
• The vacuum stops conduction.
• The metal medium within the inner and outer chamber stops heat radiating.
• Thus, The coffee stays cold inside the vacuum.