Question

All forms of energy can be converted into any other form.

True
False

Answer 1

False.

While energy is conserved and many forms can be transformed into others, not every form can be converted arbitrarily into any other form. The Second Law of Thermodynamics (entropy) prevents, for example, converting heat from a single reservoir completely into work — heat engines have a Carnot efficiency < 100%. Practical and physical constraints (reaction pathways, conservation laws, quantum rules) further limit which conversions are possible and how efficiently they occur.