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However, quantum noninvasive measurements are predicted to violate time symmetry even in equilibrium, contrary to their classical counterparts, although it has not yet been experimentally confirmed.Time asymmetries are generally distinguished as among those intrinsic to the dynamic physical laws, those due to the initial conditions of our universe, and due to measurements.What we know as the magnetic north pole was at the geographic south pole, a million years ago.This map shows how – starting about 789,000 years ago – the north pole wandered around Antarctica for several thousand years before flipping 786,000 years ago to the orientation we know today, with the north magnetic pole in the Arctic.At the heart of the Earth is a solid inner core, two thirds of the size of the moon, made mainly of iron.At 5,700°C, this iron is as hot as the sun’s surface, but the crushing pressure caused by gravity prevents it from becoming liquid And the field is continuing to grow weaker, potentially portending even more dramatic events, including a global reversal of the magnetic poles.You might imagine the magnetic field is a timeless, constant aspect of life on Earth, and to some extent you would be right. Every so often – on the order of several hundred thousand years or so – the magnetic field has flipped. And when the field flips it also tends to become very weak.What currently has geophysicists like us abuzz is the realization that the strength of Earth’s magnetic field has been decreasing for the last 160 years at an alarming rate.
So far as I know the second edition is out of print at this time.This is an illustration of the law of increase of entropy through Boltzmann's identification of the logarithm of the number of states with the entropy.Physicists also discuss the time-reversal invariance of local and/or macroscopic descriptions of physical systems, independent of the invariance of the underlying microscopic physical laws.Amplifier code: T = Transistorized, V = Vacuum Tube (Valve), S = Silent. 31, 2009 (Thanks to John Thornley and others for additional information on the UK Models) Copyright 2005-2008, Paul Ivester.For personal use only, may not be reproduced otherwise without permission.