why glowing of elLectric bulb is a physical change
Answers
Explanation:
Glowing of bulb is a physical change .When electric current passed through the electric bulb , the filaments starts in glowing and the glow stops as soon be stop as the current.......
Answer:
True
Explanation:
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The glowing of electric bulb is also considered as a physical change because it is controlled by a switch, once the bulb is switched on by a switch, it is not considered as an irreversible change since the electric bulb can be again switched off by the way it was switched on in a similar way. We
can repeat this process of switching on and off light of electric bulb several times whenever we feel like.
Some of the other examples:
The change in state of water, the glowing of bulb,
breaking of glass, chopping of wood.
Now here you might have confusion about
" breaking of glass and chopping of wood"
You might think that breaking of glass and chopping of wood cannot be reversed back into normal or similar glass or wood ( which was before). These two things is also a physical change. A physical change not only reverses things in a reversible form but also shows that the substance has any chemical matter or not.
The chopping of wood and breaking of glass is not reversed back so what, after the breaking or chopping takes place, no new substances are formed.
Important note: A change in which no new substances are formed and which can be reversed by reversing the substances is called a physical change. That is why chopping of wood or breaking of glass no new substances are produced after chopping or breaking the substances remains same, so this type of change is also considered as a physical change.
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