A certain quantity of water is heated from 20- C to 100- C- Its temperature is recorded after each 1 minute- The observations are- - Timein minute Temperaturein- - C- 0 20- 1 30- 2 40- 3 50- 4 60- 5 70- 6 80- 7 90- 8 100- 9 100- 10 100- 11 100- 12 100- - What conclusion do you draw from the above table about the boiling point of water- Explain-

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Standard VIII

Physics

Boiling

A certain qua...

Question

A certain quantity of water is heated from $20^{\circ} C$ to $100^{\circ} C .$ Its temperature is recorded after each 1 minute. The observations are:

$\begin{matrix} Time(in minute) & Temperature (i n^{\circ} C) 0 & 20 1 & 30 2 & 40 3 & 50 4 & 60 5 & 70 6 & 80 7 & 90 8 & 100 9 & 100 10 & 100 11 & 100 12 & 100 \end{matrix}$

What conclusion do you draw from the above table about the boiling point of water? Explain.

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Solution

From the table given above, we note that as thermometer shows 100°C, it becomes constant and through heat is being supplied. This means boiling point of water is 100°C and heat supplied is being used to convert every molecule of water into vapours (steam) till the whole of the water gets boiled off.

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