# What are the 1st and 2nd laws of thermodynamics?

Mar 24, 2018

Kelvin’s statement of Second law of thermodynamics says it is impossible to build a cyclic machine that converts heat into work with 100% efficiency i.e. a machine will always loose some energy and one cannot convert 100% of one form of energy into another form. The Clausius statement says that heat does not flow from a colder body to a hotter body, without a change outside of the two bodies.