Quotessence
Home / Books / The Laws of Thermodynamics: A Very Short Introduction

The Laws of Thermodynamics: A Very Short Introduction

Book by Peter Atkins · 2 quotes · Conservation Laws, Conservation Of Energy, No Free Lunch

Filter quotes by topic

AllConservation LawsConservation Of EnergyNo Free LunchNoether S TheoremPerpetual MotionSymmetry

The Laws of Thermodynamics: A Very Short Introduction Quotes

“The first law is essentially based on the conservation of energy, the fact that energy can be neither created nor destroyed. Conservation laws—laws that state that a certain property does not change—have a very deep origin, which is one reason why scientists, and thermodynamicists in particular, get so excited when nothing happens. There is a celebrated theorem, Noether’s theorem, proposed by the German mathematician Emmy Noether (1882–1935), which states that to every conservation law there corresponds a symmetry. Thus, conservation laws are based on various aspects of the shape of the universe we inhabit. In the particular case of the conservation of energy, the symmetry is that of the shape of time. Energy is conserved because time is uniform: time flows steadily, it does not bunch up and run faster then spread out and run slowly. Time is a uniformly structured coordinate. If time were to bunch up and spread out, energy would not be conserved. Thus, the first law of thermodynamics is based on a very deep aspect of our universe and the early thermodynamicists were unwittingly probing its shape.”

SymmetryConservation LawsNoether S Theorem
Book:The Laws of Thermodynamics: A Very Short Introduction
Create image

“We are within a whisper of arriving at the first law. Suppose we have a closed system and use it to do some work or allow a release of energy as heat. Its internal energy falls. We then leave the system isolated from its surroundings for as long as we like, and later return to it. We invariably find that its capacity to do work—its internal energy—has not been restored to its original value. In other words, the internal energy of an isolated system is constant. That is the first law of thermodynamics, or at least one statement of it, for the law comes in many equivalent forms. Another universal law of nature, this time of human nature, is that the prospect of wealth motivates deceit. Wealth—and untold benefits to humanity—would accrue to an untold extent if the first law were found to be false under certain conditions. It would be found to be false if work could be generated by an adiabatic, closed system without a diminution of its internal energy. In other words, if we could achieve perpetual motion, work produced without consumption of fuel. Despite enormous efforts, perpetual motion has never been achieved. There have been claims galore, of course, but all of them have involved a degree of deception. Patent offices are now closed to the consideration of all such machines, for the first law is regarded as unbreakable and reports of its transgression not worth the time or effort to pursue. There are certain instances in science, and certainly in technology, where a closed mind is probably justified.”

Perpetual MotionConservation Of EnergyNo Free Lunch
Book:The Laws of Thermodynamics: A Very Short Introduction
Create image