Page 47 - Science Class 6 Times Publication

Observation: The temperature of water increases when it is heated.

Conclusion: The heat causes the rise in temperature of a body.

Heat causes expansion of an object
When an object is heated, it becomes larger. Becoming larger means
increase in volume. It is also called expansion of an object.

Activity 4.4

To show the expansion of a solid due to heat

Materials required: A metal wire, stand, candle, etc.

Procedure
1. Take a metal wire of length 30 cm and hang it between the
poles.

2. Stretch the wire between two poles as shown in the  gure.
3. Heat the wire by burning candle for two minutes. What
happens? Let the wire cool down.

Observation: When the wire is heated, the wire hangs down due
to expansion. When the wire is cooled down, the wire
becomes stretched to the original form.

Conclusion: This activity shows that solid expands on heating and
contracts on cooling.

Times' Crucial Science and Environment 43 Book 6