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Matter — PHYSICS STD 8 — Question

ICSE BoardEnglish MediumSTD 8PHYSICSMatter5 Marks
Question
Demonstrate the process of boiling with the help of an activity.
✓

Answer

The process of conversion of a liquid into its gaseous state, at a particular temperature, on heating is called boiling. The following activity demonstrates the process of boiling of water.
Materials required : A beaker filled with water, a thermometer, a clamp stand, a Bunsen burner, a tripod stand and a wire gauze.
Procedure :
Place the beaker filled with water on the wire gauze and the tripod stand. Suspend the thermometer with the help of the clamp stand and lower it into the beaker. Start heating the beaker with the help of Bunsen burner. Observed what happens to the water and record the temperature after every $30$ seconds.
Observations :
The temperature of the water rises till it reaches the temperature of $100 ^\circ C$.
The water starts getting converted to steam, when its temperature reaches $100 ^\circ C$.
The temperature recorded by the thermometer remains fixed at $100 ^\circ C$ till the water is completely converted into steam.
Conclusion :
When heat is supplied to water, the temperature of the water rises till it reaches $100 ^\circ C.$
The water then starts getting converted into steam at a constant temperature of $100 ^\circ C$. This process is known as boiling and the temperature of $100 ^\circ C$ is known as the boiling point of water.

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