If house is left without maintenance for some time, it becomes dirty and cob-webs accumulates. If left for a long time without care, the paint peels off, cracks develop and some bricks fall off. If left for hundreds of years, it will become a ruin and may get buried in the earth due to gravity. Hence, as the time progresses, the disfigurement, damages, disorder increases. In any system, the disorder or randomness increases with time, if left uncared. It is called entropy in physics and it is governed by second law of thermodynamics.
But why it happens? There are certain ways to construct a house{orderly arrangement}. But there are millions of ways for disarrangement. That is, more chance for disorderly arrangement of bricks, cement, iron bars etc,. So naturally the house will go into disarrangement easily. Here we can conclude that the disorder or entropy is a 'measure of elapsed time'.
Another example: If a perfect ice cube is left on the table, it will slowly melt and become water. The water will slowly vaporise and become gas. The orderly arrangement of water molecules in ice has now dispersed into disorderly gas molecules.
For human being to live healthily; for trees to grow; for machines to work; for birds to fly; for beauty to prevail; the order, perfect arrangement and neatness is very much required. No order means no life.
A heap of bricks , sand and cement will never make themselves into a house. But a house will become a heap of debris with the progress of time. Orderly arrangement requires effort and work which is expected of human beings.
That is why regular maintenance of machines, cleanliness of body, house and holy places are stressed. The saying goes, "cleanliness is next to godliness".
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