SAQ : What is the significance of the mechanical equivalent of heat 4.2 × 10^7 erg/cal?

Question

What is the significance of the mechanical equivalent of heat 4.2 × 10⁷ erg/cal?

Answer

The mechanical equivalent of heat, 4.2 × 10⁷ erg/cal, is significant as it establishes the relationship between mechanical energy and heat energy, allowing for the conversion and understanding of energy in different forms.