Correct me if I’m wrong, but since we are technically never really touching anything due to the electrons within our body repelling the electrons that make up an object (eg. A chair) I’m technically hovering above it by an unfathomably small distance. Why is it I can still feel the texture of the chair (or anything actually) if I’m not really touching it?
Thanks a lot (:
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Things we’ve been taught at school are usually simplified so that they allow us to understand why things happen and the relationships between different things. For example, electrons don’t actually circle around the nucleus of atoms like planets circle around the sun.
Instead, it’s more accurate to think of electrons like a horde of insects where you can’t easily spot a single insect because of their speed although you can see the entire horde.
The path electrons take around the nucleus varies. Some move faster and some move slower. However, each individual electron generally stays on the same path. Sometimes the paths can change but two electrons can never move on a similar path. According to something called Pauli exclusion principle, two electrons can never have the same quantum state or, put more simply, move along a similar path.
Although electrons move indefinitely, they need energy to change their path to a more energetic one. Correspondingly, the electrons will give off energy when they change to a lower energy path.
For example, an electron may move to a higher energy path when it’s hit by light. For example, light hitting something like a desk won’t get very far because all the electrons “like” to absorb some of its energy. This energy is released instantly and we see this as reflections and colors. This is why the desk looks solid.
Now, when you touch the same desk, the electrons in your hand move close to the electrons of the desk. When this happens, electrons change paths. This is because electrons can’t move along a similar path. So electrons of atoms moving close to each other have to change their paths to higher energy paths. This time, though, the energy doesn’t come from light but the force moving the atoms closer to each other. In the case of a hand moving towards a desk, there are billions and billions of electrons moving closer to each other and all of them need to change their paths which requires a lot of energy. So much, in fact, that the hand is stopped and can no longer be moved closer to the table. This is the main reason why things feel solid.
An another reason our hand is stopped instead of moving through solid objects is that every electron has a negative electric charge. Similar charges repel each other which makes it even more difficult to move objects very close to each other.
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