Make two paper cups by folding a sheet of paper. Pour about 50 ml. of water in
one of the cups. Heat both the cups separately with a candle.
a. Which paper cup will not burn?
b. What could be the reason for this?
Answers
Answer:
When paper cup is heated containing water, water absorbs the heat coming from the burning source and thus prevents the paper from reaching its ignition point. Hence it does not burn. Water in the cup becomes hot instead. This is due to absorption of heat by water. The paper cup in which water is placed is having ignition temperature higher than the boiling point of water, and water have high latent heat of vaporization. This is also possible that temperature provided to water does not exceed its boiling point. Hence, water can boil in paper cup without burning the cup. ARE DIXIE® TO GO CUPS MADE FROM POLYSTYRENE FOAM? No, our Dixie® To Go cups are made from paper with a polyethylene coating and contain approximately 80% cellulose fiber by weight. Go to my Profile and you can find all about Candle Making material there...
Explanation: