Question 15 Marks
Describe an experiment to show that solids expand on heating.
Answer
View full question & answer→The following activity shows that solids expand on heating.
Materials required : An iron ball, an iron ring, a metal stand with a hook and a burner
Procedure : Take the iron ball and the iron ring such that the ball should just pass through the ring. Suspend the ball by the metal chain from the hook of the stand. Heat the ball and then try passing the ball through the ring. What do you observe’? Now, cool the ball and try passing it through the ring again. What do you observe now?
Observation :
$1.$ When the ball is heated, it does not pass through the ring, because it expands on heating.
$2.$ When the ball is cooled, it easily passes through the ring, as it regains its original size.
Conclusion : Solids expand on heating.
Materials required : An iron ball, an iron ring, a metal stand with a hook and a burner
Procedure : Take the iron ball and the iron ring such that the ball should just pass through the ring. Suspend the ball by the metal chain from the hook of the stand. Heat the ball and then try passing the ball through the ring. What do you observe’? Now, cool the ball and try passing it through the ring again. What do you observe now?
Observation :
$1.$ When the ball is heated, it does not pass through the ring, because it expands on heating.
$2.$ When the ball is cooled, it easily passes through the ring, as it regains its original size.
Conclusion : Solids expand on heating.
