* Physical Change: A physical change alters the form or appearance of a substance but doesn't change its chemical composition.
* Chemical Change: A chemical change results in the formation of new substances with different chemical properties.
In the case of a lamp:
* Energy Transformation: The lamp converts electrical energy into light and heat energy.
* No New Substances: The filament in the lamp doesn't change its chemical composition when it glows. It's simply emitting photons (light particles).
* Reversible: The process of a lamp emitting light is reversible. If you turn off the lamp, the filament stops glowing and the energy transformation stops.
Therefore, since the lamp doesn't create new substances and the change is reversible, it's considered a physical change.
