Explain an activity to observe the Ignition temperature
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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. Paper cup which contains water do not burns and paper cup which does not contain water starts burning quickly.
Paper cup which contains water do not burn till water is vapourised. This happens because heat introduced to paper cup containing water, goes to water. Additionally water keeps the ignition temperature of the paper cup below limit. This the cause that paper cup containing water does not burn.
On the other hand paper cup having no water, reached its ignition temperature required to burn paper quickly and it starts burning.
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