> Puffed rice and wheat are done in machines that lower the air pressure to create the same conditions as popcorn. You mean raise the air pressure. They cook t

> Puffed rice and wheat are done in machines that lower the air pressure to create the same conditions as popcorn. You mean raise the air pressure. They cook them at very high pressure, and then suddenly release the pressure and they all explode. See: https://en.wikipedia.org/wiki/Puffed_grain https://en.wikipedia.org/wiki/Puffed_grain