Some things have universal certainty, such as death, taxation, the second law of thermodynamics. This article mainly from the physics point of view to tell you why the room is does not need to clean.
In 1824, the French physicist Nicolas Léonard Sadi Carnot first proposed the second law of thermodynamics when he thought about how steam engines worked. To this day, the second law of thermodynamics still holds and becomes an immutable fact. No matter how hard you try, you can't get rid of the control of its unshakable conclusion that entropy never decreases in isolated systems.
How Many Arrangement of Air Molecules
If you are given a box of air to measure some of its properties, your first reaction may be to take out a ruler and thermometer and record some important numbers that sound scientific, such as volume, temperature, or pressure. After all, numbers like temperature, pressure and volume provide all the information you really care about, and they tell you everything about the air in the box. So how air molecules are arranged is not important. The air molecules in the box are arranged in many different ways, all of which can lead to exactly the same pressure, temperature and volume. This is the role of entropy. Those that can not be seen can still lead to exactly the same observable measurements under different permutations, and the concept of entropy describes exactly the number of different permutations.
How Entropy Changes Over Time
Why does the value of entropy never decrease? You clean the floor with a mop or a mat, you clean the windows with duster and window cleaner, you clean the cutlery with dish brush, you clean the toilet with toilet brush, and you clean clothes with lint roller and microfiber cleaning clothes. After all this, you think your room is getting very tidy. But how long can your room stay that way? After a while, you will realize that all your efforts are in vain.
But why can't your room stay tidy for the next few years? That's because, as long as one thing in the room changes, the whole room is no longer tidy. You'll find that the room is much more likely to be messy than it is to be tidy, just because there are too many ways to make a room messy.
The Extremely Demanding Entropy
Similarly, you can't stop the air molecules in the room from suddenly deciding to move collectively in the same direction, crowding into the corner and suffocating you in a vacuum. But the movement of air molecules is controlled by countless random collisions and movements, a never-ending molecular movement. For a room, there are few ways to make it clean, and there are countless ways to make it messy. Different "messy" arrangements (such as putting dirty socks on the bed or on the dresser) can lead to the same measurements of temperature or pressure. The entropy indicates how many different ways can be used to rearrange the chaotic room when the same measurements can be obtained.
Post time: Aug-29-2020