why substance gets heated when heat is provided to it?
It absorbs heat energy
we can further ask why it absorbs heat?
and most important is to understand what actually is Heat?
Heat energy has property of Expand, So materials are good either bad conductors of heat , Hence substance get hot when heated
and why substance get expanded while heated? …there are anomaly too… like with Water… at lower temperature it contracts while heated… if we explain in Electronic level then only we’ll get some satisfactory answer…