Consider the following scenario where two paper cups are heated:
Cup 1 is filled with water.
Cup 2 is empty.
Which of the following statements is true?

Cup 2 burns last due to decreased ignition temperature.

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Cup 1 burns last due to increased ignition temperature.

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Cup 1 burns last due decreased ignition temperature.

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Cup 2 burns first due to increased ignition temperature.

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Solution

The correct option is B Cup 1 burns last due to increased ignition temperature.
Ignition temperature is the lowest temperature at which a substance catches fire.
When we try to burn a paper cup containing water (cup 1), the heat supplied to the paper cup is transferred to water by conduction. So, in the presence of water, the ignition temperature of paper is not reached.
Hence, cup 2 will burn first.

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Consider the following scenario where two paper cups are heated: Cup 1 is filled with water. Cup 2 is empty. Which of the following statements is true?

Consider the following scenario where two paper cups are heated:
Cup 1 is filled with water.
Cup 2 is empty.
Which of the following statements is true?