@thegreen.archive on Instagram: "Ever wonder why gravity bongs hit so hard? It’s pure physics turned into a smoke trick. A gravity bong uses water and air pressure to pull dense smoke into a chamber — usually made from a cut bottle and a larger container or bucket. When you light the weed and slowly lift the bottle, the rising air inside creates negative pressure, drawing smoke from the bowl into the empty space. Push the bottle back down, and the compressed air forces all that concentrated smok