Let me tell you something very beautiful. Yes. Beautiful is the word. What if I told you that... We are all empty spaces? It's not a metaphor, it's not a figurative speech. It is what it is, we are all empty spaces...
Look at your hand. What do you see?
You see your fingers, your skin..
Delve deeper. What do you see?
The creases on your palm, finger prints.
Go on... What do you see?
The epidermis of the skin... Skin tissues?
Cells... Thousands of them. No, millions of them.
There is the phospholipid membrane surrounding the cells, enclosing the inner cytoplasm.
Proteins, hurling everywhere randomly within the fluid cytoplasmic cavity; Enzymes, the intricate machinaries of the cell, working as if they are sentient; DNA, the recipe of life, the blueprint to complex biochemistry, unwinding and duplicating in a blink of an eye.
Billions of atomic bonds were formed, and broken simultaneously. New molecules assembled every fraction of a second.
They are nothing more than just the exchange of electrons in a vast bargaining atomic market. Transactions made in the form of charged currency. Stormy, unpredictable movements of the electrons, orbiting the tranquil nucleus in the center.
But nay, not all nucleus are as still as the eye of the electron hurricane. Some nucleus of massive radioactive atoms gets split into fragments due to unstable fluctuations.
What lies beyond? Are there nothing but protons and neutrons and electrons that makes us? Or are there a far more fascinating constellation of smaller particles, awaiting for our quantum explorers to discover?
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| DNA, secret ingredient to life. |
Ahem. Forgive me for the failed Carl Sagan imitation. But you get the point. Point is, what is smaller than the (supposedly taught by teacher as the smallest particles of) proton, neutron, and electron. In this post, I shall attempt to explain away some introductory basics of particle physics, and then naturally we will converge to the title of this post of "we are empty spaces", where everything will (sort of) be clear to you.
Let me start by telling you this: your high school chemistry teacher was wrong. It was a conspiracy all this while. They thought you were incapable of understanding something deeper, so they stopped at telling you that protons, neutrons, and electrons are all there is.
Well, not so much of a conspiracy lah. But yes, you/they were wrong. The books were wrong. The examination papers were wrong. Wrong wrong WRONG!
Ok. With that aside. I shall start by telling you the current understanding of particle physics.
What are fundamental particles? Fundamental particles are the smallest observable particles, they are smaller than protons and neutrons, which essentially are made up of these fundamental particles. Currently, physicists think that these fundamental particles are the basic ingredients of the matters in the universe. If you do not know what does matter mean, just cut out that part and read: basic ingredients of the universe. That should serve the purpose for now. Note that I said "smallest observable particles" because these particles can be detected in lab, however it is unknown if they are made up of smaller things.
To keep things simple. There is just three types of fundamental particles you need to know:
Leptons, Quarks, and Bosons
That is it. No sweat right? Now allow me to explain further.
Leptons are... well, leptons... Maybe I should try another way. Electron is part of the family of leptons, which has particles that has either 0 charge, or -1 charge. There is no need to know about other leptons other than the electron.
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| Quark Family |
Quarks are the particles that make up protons and neutrons. There are 6 types of quarks, all with either +2/3 charge or -1/3 charge. So basically a combination of 3 quarks form protons or neutrons depending on the sum of the charges of the quarks.
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| How quarks form bigger particles. |
Bosons are kind of difficult to grasp, they are known as the carrier of the fundamental forces. If I may put it this way, photon is a boson. If you don't know what is a photon, a photon is a light particle; light consists of photon particles. Light as you know it, is a manifestation of the electromagnetic force. Before I fry your brain, let just stop at bosons are the particles that creates electromagnetic force, weak and strong nuclear forces, and gravitational force. Without bosons, we will not have these forces, and quarks and leptons will just exist without doing anything to each other.
Interaction between these particles form the very fabric of our universe. Bosons give rise to nuclear forces that allow quarks to stick together in groups of 3, forming neutrons and protons. The nuclear forces created by bosons also bind neutrons and protons together within a nucleus of an atom. Electrons whirl around the nucleus due to charge attraction.
But even though it seems to you that the proximity of these interactions are very close, it is not. These particles interact at distances so far apart, thinking about it will melt your brain. Okay maybe not so serious, but almost.
Let me give you an idea.
Imagine you have quarks and electrons, almost similar in size (in reality quarks are at least 10 times smaller than electrons, but let us just imagine they are the same size). Let us give them a size in metric measurement of, let's say, 1 millimeter across. How big is 1 millimeter? It is more or less the thickness of 10 pieces of your normal printing paper.
If quarks are 1mm across in size, the protons and neutrons they form will be about 1 meter across! Imagine, 3 quarks of 1mm across occupying a space of 1 cubic meter! What is in between them you ask? Well, nothing! Between them is nothing but empty spaces.
There is more. Putting together the protons and neutrons, you will get a nucleus 10 meters across, all made up of quarks just 1mm long at most.
It does not end here, the next is the most mind-boggling.
Now we have the electrons, orbiting the nucleus. The extent of electrons' orbit around the nucleus is the boundary of the atom. So the further the electron orbits around the nucleus, the bigger atom we have. Typically, at this scale, the entire atom will be 100 kilometers across. Yes, you have not read me wrong, it is one-hundred kilometers! Again, imagine all these are made up of quarks and electrons about 1mm across. What is in between? Empty spaces.
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| An illustration of the nucleus and atom. |
If you want to calculate, the percentage of the volume taken by these quarks and electrons are so close to zero we might as well say that the universe is 100% empty spaces.
We are empty spaces...
But we do not perceive it that way. We can see things! We can touch and feel things! So how can the universe be almost vacuum?
The answer, my friends, lies mainly in one of the fundamental forces of physics - The Electromagnetic Force. But that is for another day.
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| Electromagnetism - The Beautiful Force |
Till next time.
Cheers~
p.s. Extra freebies for nerds, check this out! http://www.pha.jhu.edu/~dfehling/particle.gif

















