Question

When water vapour condenses outside a soda can what happens to energs?

Answer 1

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In this case, only heat is transferred. Confused? Let me explain. The cool drink inside the cup is at a lower temperature than the surrounding air. Thus a thermal (heat) imbalance exists. Now, a thermal body (something that has heat or a lack of it) and its surroundings, which are not of the same temperature will continue to transfer heat between each other (from the hotter body to the colder one) until they are both at the same temperature (thermal equilibrium). Since we are talking about a cool drink here, it means the surroundings of the cup (air) is warmer. So at the interface of the cool and warm bodies i.e. the outside of the cup, there will be a transfer of heat from the warm air in surroundings of the cup to the cooler outer surface of the cup. On losing heat to the cooler surface of the cup, the air (along with the humidity it contains) cools down at the surface of the cup. This cooling down of the surrounding air and its humidity (water vapour) brings the molecules of the water vapour closer (substances, including gases, expand upon heating and contract upon cooling) to each other, allowing them to form the tiny droplets seen on the outside of the cool cup.

Again, only heat is transferred.

In addition, this process of heat transfer is responsible for the condensation seen on car windshields on cold days (the inside of the car is warmer and the outside is cooler).

RegadsVishal_____________(BhamBhamBhole)

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