conversion of energy वाक्य

As one enters the centre one is greeted with glimpses of several interesting and eye catching exhibits in the first floor near the reception area including the giant energy ball which covers four floors of the building and demonstrates the principle of conversion of energy.
While the total amount of energy is the same ( except for some theoretical cases where it's converted into mass ), when any conversion of energy forms takes place, some of the energy is converted into heat, and heat can not be converted back into other forms of energy ( although large differences in temperature can create other forms of energy, as in a Carnot engine ).