Question

Q No. 18. What does happen when an object is heated? اس کا درجہ حرارت کم ہو تا ہے a) Its temperature decreases) اس کے ذرات کی انرجی کم ہوتی ہے b) Its particles lose energy) () (b) (c) It contracts (d) It expands No 18 What is the main reason for thermal expansion in سکھر جاتا ہے یہ پھیل جاتا ہے​

Answer 1

1. When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.

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