Question

the water kept in a paper cup start boiling after giving continuously heat why?​

Answer 1

Answer:

We can boil water in a paper cup the reason that he heat given by the flame is quickly transferred from the paper cup to the water. As a result the temperature if the paper does not reach the ignition temperature and hence is not burned. The heat gained by water raises its temperature and finally it starts boiling.

Answer 2

Answer:

because molecules in a water can move and they vibrate vigorously and gain their kinetic energy