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We see time as absolute
We know that time flows from the past to the future. We remember the past and make predictions about the future. You stir cream in your coffee, and it mixes in. It doesn't un-mix.
The classical understanding of the nature of time is that time is absolute - that time ticks by the seconds, minutes, hours, and years at the same rate for everyone.
The directionality of time comes from the idea in classical physics called the 'second law of thermodynamics', which states that a quantity called 'entropy' (which is a measure of the disorder of a system) always increases.
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Einstein's view of time
Because of the equations of special relativity and the nature of the speed of light, Einstein was forced to let go of the Newtonian idea of absolute time.
Einstein taught that time and space are connected. Space and time are relative. It ticks at different rates for differ...
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Gravity affects time
Clocks tick at different rates depending on where they are in Earth's gravitational field.
From Einstein's perspective, time is integral to reality itself. Looking at the way the equations of quantum mechanics evolve in time, you could run the tape forwards or backwards wi...
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The entropy law
The second law of thermodynamics, the so-called 'the entropy law', it is said to be one of the most important laws in nature. This law states that entropy, which is a measure of disorder in a closed system, almost always increases in time.
Physics without time
If one looks at reality on the smallest scale, using equations of quantum gravity, time vanishes. However, we still perceive time as moving forward sequentially.
Key aspects of time are described by the second law of thermodynamics, which states that heat always passes fro...
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