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Calorimetry

Temperature

Temperature

Heat is a form of energy that can be converted into other forms of energy (like mechanical energy, electrical energy, etc.) and vice versa. We use heat for various purposes such as cooking.

 One hot day, on returning from school, Ravi touched the iron gate leading to his house. He found it to be extremely hot. Later, he touched other things made of iron present inside his house and found that they were not hot. Then, he touched other substances (not made of iron) present in his house to determine whether they were hot or cold. He listed his observations as in the table given below.
 Substance Hot/ Cold Tea Hot Coffee Hot Ice Cold Ice cream Cold Cooked rice Hot Frozen meat Cold

Try to make a table, listing some other substances present in your house and classify them as hot or cold. But how do you decide whether a substance is hot or cold? Can you always tell whether a substance is hot or cold simply by touching it? The following activity will help you understand the concept better.

Activity:

Take three containers and label them as A, B and C. Take hot water in container A, and cold water in container C. In container B, mix hot and cold water in equal amounts. Now, place your left hand in container A and right hand in container C for two minutes. Then, dip both your hands in container B.

What can you say about the water present in the three containers? Note down your observations in the table given below.

 Container Hot/Cold A B C

What is your observation for container B? Is the water in container B hot or cold?

When you dip your hands in container B, your left hand will tell you that the water is cold, …

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