Akanksha has made two paper cups by folding a sheet of paper, she poured 50 ml 0f water in one of the cups and heated both the cups separately with a candle. a. What happens to the empty paper cup when it is heated? b. What happens to the paper cup with water?c) does the water become hot?
Answers
Answer:
Hint: The ignition point is defined as the fire point, which is the point at which the fuel gets fired. That means the possible least temperature at which the vapour of a fuel is continuing the burning for a minimum of five seconds after the ignition by an open flame having standard dimensions. Any substance will catch fire only when the ignition point I reached. This may help you to solve this question.
Complete answer:
A thin paper cup which is filled with water will not catch up the fire if it is placed over a flame. This is because the paper cup does not become appreciably hotter than the water it carries.
If the paper cup is heated carrying water, the water will be absorbing the heat coming from the burning source and thus stops the paper from reaching its ignition point. Therefore it will not burn. Instead of this, water in the cup becomes hot. This is because of the absorption of heat by water in it.