an iron Smith is heating an iron bar what is happening in the iron bar
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endothermic and exothermic reactions
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At first it's temperature will increase. Also the length will increase little bit because of it properties of thermal expansion. Next if you still continue to heat when the temperature of the rod reaches to the melting point (1538 degree) the rod will start melting. ...
when a black smith heats an iron bar its length increases so its volume but the mass since remaining constant due to which its density decrease
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