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Class 9
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Physics
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Thermal Properties Of Matter
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Melting and boiling: experiment

Thermal Properties Of Matter

Melting and boiling: experiment

Physics

Experiment for Measuring the Heat of Fusion and Vaporization of Water

Converting Ice (Solid) into Water liquid - Measuring Heat of Fusion

Equipment needed:

  • Beaker with ice shavings

  • Bunsen Burner

  • Thermometer

  • Stopwatch

  • Stand

Method:

  1. Take a container with small pieces of ice in it and place it on a stand.

  2. Suspend a thermometer in the container to measure the temperature.

  3. Take a stop watch to measure accurate time at different stages.

  4. Now place the container on the burner.

  5. Record the temperature at regular time intervals.

Observation:

  • The ice will start melting after absorbing heat. The temperature will remain same up to 0°C0\degree C0°C until all the ice melts.

  • Note the time t1t_1t1​ and t2t_2t2​, which the ice takes to melt completely into water at 0°C0\degree C0°C. Supply heat continuously to water at 0°C0 \degree C0°C, again note the time, its temperature will start to increase.

  • Note the time, which the water in the container takes to reach its boiling point at 100°C100 \degree C100°C from 0°C.0 \degree C.0°C.

  • Draw a temperature-time graph as shown in graph.

  • Calculate the heat of fusion of ice from the data using the graph.

Converting Water (Liquid) into steam (Gas) - Measuring Heat of Vaporization

This is a continuation of the previous experiment.

Method:

  • The container now contains boiling water.

  • Continue to supply heat to water, till all the water convert into steam.

  • Note the time during which water in container completely changed into steam at its boiling point.

  • Plot a graph using the values and use it to calculate the heat of vaporization of water