Experimental Sciences

Heat Transfer: Conduction, Convection and Radiation

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Three different experiments were conducted by Grade 8 students to demonstrate heat transfer through conduction, convection, and radiation.

Conduction

To see the evidence of conduction, a spoon was heated by the use of boiling water. The difference in temperature of the boiling water, as well as the spoon, caused heat transfer between the two objects. After some time, the water and the spoon had the same temperature.

The spoon being heated up using boiling water

The spoon being heated up using boiling water

Convection

Convection is another method of heat transfer. It is due to the movement of a fluid (liquid or gas) between areas of different temperatures. In the experiment, the circular movement of the pencil shavings showed convection currents that occurred in hot water.

In this experiment, the spoon was removed and pencil shavings were placed into heated water. Due to the difference in temperatures of water from varying depths (surface/bottom), convection current occurred as evidence of the movement of the pencil shavings.

In this experiment, the spoon was removed and pencil shavings were placed into heated water. Due to the difference in temperatures of water from varying depths (surface/bottom), convection current occurred as evidence of the movement of the pencil shavings.

Radiation
This experiment was done by asking students to get close to the heat source. Students could feel the heat radiated by the hot plate.

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