The rails expand during the heat of a summer day
JJ Thomson discovered electrons using the cathode ray. Electrons are negatively charged particles that orbit around the nucleus of an atom. Finding out that there was a negative charge to balance out the positive charge. This later helped develop Hund's Rule and the Pauli Exclusion Principle.
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Explanation:
Carbon dioxide is the answer I think.
Hope it helps...
Particles will have more energy and will vibrate really fast.
(Hope this helps)