Sound is a mechanical wave which is another way of saying it requires a medium to move through; it’s the transmission of energy from particle to particle, each one oscillating around its point and colliding with the next. In theory then a sound could travel forever, if there were enough particles — but of course it can’t, each collision loses some energy and eventually there is hardly any oscillation at all, and then nothing. This is a kind of math problem, you could apply the concept of limits, which is a way of saying things are forever approaching some end and never arriving, like when you are waiting for a bus or a phone call in the rain to take you somewhere. You could be travelling away from, or towards, there’s really only two directions, and when we apply direction then we have a vector. A vector is a kind of an arrow, it always finds its mark. Is sound a vector? It’s interesting to think of, like the concept of limits, I get closer but no further to knowing the answer. The decrease in oscillation as energy is lost from the system (we can call it a system, which is several bodies which are working on each other in the same moment of time) is experienced as a decrease in amplitude, which is the distance displaced from a neutral position (a neutral position, do you have one? I did, once) in either direction, away from or towards. Is sound a vector? We did this already. The decrease in amplitude is a decrease in what we call volume, the sound gradually getting quieter and quieter until we reach the limit. It looks like this:

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