In addition to heat lost through evaporation, which depends on the mug's shape and the surface area of the coffee exposed to the air, your coffee will cool off as the mug, itself, draws heat through conduction and loses it through convection.
Hope it helps :D
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janessaakeekomasangk
why do they use the ceramic cup po. hindi yung ceramic or glass
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Why is ceramic used to make mugs vases and cups?
Ceramic Retains Heat Better Than Glass
In addition to heat lost through evaporation, which depends on the mug's shape and the surface area of the coffee exposed to the air, your coffee will cool off as the mug, itself, draws heat through conduction and loses it through convection.
Hope it helps :D