Why is the Hess' law important in physics?

1 Answer
Nov 11, 2015

First law of thermodynamics


The first law of thermodynamics states that the energy remain constant in a system. You can transfer energy, but you cannot create or destroy it. Or what every chemistry/physics professor loves to say "there's no such thing as a free lunch!"

Hess' Law is just a way of observing the transfer of energy through chemical reactions. It shows mathematically how energy is transferred, but never created or destroyed.