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How Small Is An Atom? Spoiler: Very Small.

How Small Is An Atom? Spoiler: Very Small.


Atoms are ridiculous and unbelievably
small. A single human hair is about as thick as 500,000 carbon atoms stacked
over each other. Look at your fist, it contains trillions
and trillions of atoms. If one atom in it were about as big as a
marble, how big would your fist be? Well… about the size of Earth.
Hm… still hard to imagine? Let’s try something different Look at your little finger. Imagine that its tip is as big as the
room you’re sitting in right now. Now fill the room with grains of rice. One rice corn represents one cell of your fingertip. Now let’s zoom in on the rice corn. And now, one cell is as big as the
room you’re in right now. Let’s fill it with rice again.
This is about the size of a protein. And now, let us fill all the empty spaces
between the rice corns with fine grains of sand. This is roughly how small atoms are. What is an atom made of? Let us just pretend that atoms look
like this for a minute to make it easier to understand. An atom consists of three
elementary particles: neutrons, protons and electrons. Protons and neutrons bind together and
form the atom core, held together by the strong interaction, one of the four fundamental forces in
the universe. They are made from quarks and
held together by gluons. Nobody knows exactly how small quarks are. We think they might literally be points,
like in geometry. Try to imagine them as being
zero-dimensional. We suspect that quarks and electrons are the most fundamental components
of matter in the universe. Electrons orbit the atom core. They
travel at a speed of about 2,200 km/s, fast enough to get around the Earth in
just over 18 seconds. Like quarks, we think electrons are
fundamental particles. 99.999999999999% of an atom’s volume is just empty space…
Except that it isn’t. What we perceive as emptiness is actually
a space filled by quantum fluctuations, fields that have potential energy and
build and dissolve spontaneously. These fluctuations have a fundamental
impact on how charged particles interact. But that’s a topic for another video. How much space do the core and
electrons actually fill? If you were to subtract all the spaces
between the atom cores from the Empire State Building,
it would be about as big as a rice corn. All the atoms of humanity would
fit in a teaspoon. There are extreme objects where states
like this actually exist. In a neutron star, atom cores are
compacted so densely that the mass of three Suns fits into an
object only a few kilometers wide. By the way, what do atoms look like? Well, kind of like this. Electrons are like a wave function and a
particle at the same time. We can calculate where an electron might
be at any given moment in time. These clouds of probability,
called orbitals, are where electrons might be
with a certainty of 95%. The probability of finding an electron
approaches 0 the further we get away from
the atom core, but it actually never is zero, which
means that, in theory, the electron of an atom could be on
the other side of the universe. Okay, wait a second. These strange thingies make up all
the matter in the universe. For many dozens of known elements, you don’t need many dozens of
elementary particles, just three. Take one proton and one electron,
and you have hydrogen. Add a proton and a neutron,
you have helium. Add a few more, you get carbon,
a few more, fluorine, even more, gold, and so on. And every atom of an element is the same: all hydrogen atoms in the universe,
for example, are the same; the hydrogen in your body is exactly
the same as the hydrogen in the Sun. Do you feel confused right now?
We certainly do! Nothing on this scale of the universe
makes any sense in our world, and we’ve not even begun talking about
quantum mechanics or the particle zoo, which are even stranger! Our model of atoms has changed a number
of times since we first conceived it, and the current one will certainly
not be the last. So let us support scientists and research and wait for the next wave of
mindboggling new information about this strange world that is the
basis for our existence. Subtitles by the Amara.org community


Reader Comments

  1. If the probability of finding an electron out the orbital aproaches 0 but doesn't reach it, if the universe is infinite (not confirmed) and the sum of infinite decimal numbers is infinite, no matter how little they are, ¿why do we find electrons in those orbitals, since we can find it in other infinite number of positions?

  2. I think its possible to say, that hydrogene can have neutrons in core, and give people informed about isotopes. I mean, you gave info about electron cloud, its way more difficult, than deyterium

  3. Why was this NOT interesting when I was a kid????? Now that I have kids I’m interested and trying to get them interested. I got here from watching an ultra cold superconductor floating around some magnets. I suppose it isn’t too late to learn and be interested. Oh, and for the record, I’ll be bringing something to market 9/20/2021 where you guys will say, “Hey I knew that guy from commenting on this YouTube video!” Anyhow, this is cool. Trying to make it cool for my kids.

  4. i remember our teachers trying to make atoms sound like there are a lot of them. in reality YES there are a lot but becouse thay thought we were dumb they said that in a single storm there are 3000 atoms. not impressive. so first it's a storm, not something that has a fixed number of atoms AND of what? what do you meen by saying that? did you meen how many oxigen atoms move from the storm? what kind of storm? what about air density? when thay said that in a storm there are 3000 atoms I was confused. those were the questions I asked myself during the time. OH and I also asked myself why something about air? that's not dense so why try to impress us with a small number which just acording to you a FIST basicly has TRILLIONS AND TRILLIONS of atoms. I guess I don't understand how education works. hmm you should do a video about education and.. hey if you do it just right you could pull of a skillshare sponser becouse it's about learning..

  5. You didn't even start talking about how protons neutrons and electrons can all change into each other. It's really fascinating but mind blowing at the same time

  6. If the theoretical size of a quark was the same as a tennis ball, and the universe was the size of one pixel on a 4k TV, it would take just under 400 4k TVs to represent a penny.

  7. Substract the space between atom's cores and electrons and all the atoms of humanity would fit inside a table spoon? Are you serious?

  8. 4:03 But, the Sun is very very very hot. THEN HOW?
    (Ok, I understand that we don't yet know the connection between the microscopic and the macroscopic world, but still.)

  9. Xyhumangeneqeqtpcibmispipgpsgmp

    Imeionline

    Interisoconnectings

    Getbacktoyouyourschool
    Atomsqeqtpqubitsisoispipipupdatings

    Ismachinespcispipgpssaybhejagayadatanavintumkarnaykayliyehindi
    Typingserrorcodingssay

  10. Thank you again for making such interesting educational video for human
    I really appreciate your teams's efforts for always making good science videos
    with Love

  11. That screen of fluctuating triangles are very similar to how the “running lights blind spot spiral” I get during an ocular migraine

  12. I don't feel confused that hydrogen in us is the same as hydrogen elsewhere?
    it's hydrogen, that's the thing it be
    tha's what it do

  13. Everyone talking about staffs like grafhics and atom size

    Meanwhile me " this pokemon belt is legit man " 4:05

  14. 3:48 (wrong) Helium has 2 protons 2 electrons and 2 neutrons! that Helium atom in the image is Helium-3 which is a helium isotope.

  15. Is it possible for an electron that is paired with an atom to get too close to a black hole to be able to switch it's orbit again. What would happen to the Atom?

  16. “…which means its electron could potentially be on the other side of the Universe.”
    Me: scream in mind blown shock.

  17. Till Bohrs model, it was a perfect atom. But quantum mechanical model makes an atom insane, mindboggling.

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