Ice melting in a warm room is a common example of increasing entropy, described in 1862 by Rudolf Clausius as an increase in the disgregation of the water molecules in ice.
]Leave your car out in the rain long enough and it will rust; then over time just fall apart. Castles crumble, fruit rots, humans age and die. But a process that happens one way surely can happen the other way.
However there are a huge number of ways in which the car can rust, fall apart, disintegrate and only one way
it can remain new, shiny and pristine. Consequently if all possibilities are equally likely then it is more likely than not that the car will rust and eventually disentegrate.
This process is termed 'entropy' or the 2nd law of thermodynamics. Entropy can only increase and can never decrease. So all things being equal, the disordered states will prevail. Chaos will inevitably reign.
But why does the law of entropy prevail? It is because the universe appears to be expanding, its constituent galaxies flying apart like so much cosmic shrapnel in the aftermath of the 'Big Bang'.
And this is the reason why your car rusts, your coffee cools and we ...well, you know...
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