By Alex Vikoulov
"The arrow of time obscures memory of both past and future circumstance with innumerable fallacies, the least trivial of which is perception." - Ashim Shanker
Time makes us tick... or rather, our consciousness makes time tick. When you fall asleep, you are plunged into a timeless unconscious state, whereas the neurons of your brain never stop "talking to each other", then while you're still asleep, consciousness reemerges - that's when your mind plays a kaleidoscope imagery in the form of dreams. Only when you wake up, time starts "ticking" for you again - in one direction.
This is the third and final part of my essay - "Temporal Dynamics: Seven Misconceptions About The Nature of Time." I'd suggest you review the first five misconceptions about the ultimate nature of time before proceeding with this final part of the essay.
So, here's Part I:
... and Part II:
Misconception #6: Time Can Only Move Forward
To all intents and purposes, time seems to have a direction. Although we experience time in one direction - we all get older, we have records of the past but not the future - there’s nothing in the laws of physics that insists time must move only forward. For example, the laws of motion make no distinction about the direction of time. If you watched a video of a pendulum, you wouldn't be able to tell if the video was being run forwards or backwards. The same time symmetry is found in the equations of quantum mechanics. So what aims the time's arrow?
There's a long-standing answer to this, which has been worked out in the late 19th Century by the Austrian scientist Ludwig Boltzmann, stating that the arrow of time results from entropy - the level of molecular disorder in a system, which continually increases - a fact encoded in the Second Law of Thermodynamics.
Entropy, according to Boltzmann, is about probabilities. Objects with low entropy are orderly, and therefore less likely to exist. High-entropy objects are disorderly, which makes them more likely to exist. Entropy always increases, because it's much easier for things to get random and disorderly. If you put ice cubes into a glass of water and let them melt, the entropy inside the glass goes up. In the following video, entropy is explained in layman's terms :
Video Credit: The Good Stuff - What is Entropy?