My son wants to know how we can perceive light and it not take up any space at the same time.
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Occupy space is layman’s term for the true definition of ‘mass’.
Light is layman’s term for photon, which have no mass. So they do not occupy space. If several photons happen to be in the same timespace, they will combine and amplify.
Electrons have mass. They occupy space. You can’t have electrons in the same timespace. They repulse themselves.
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