Corn can be puffed into popcorn through high temperature and pressure.
Tips
usage
Most often seen as 膨化食品 (pénghuà shípǐn, 'puffed snacks') - the umbrella category for chips, cheese puffs, rice crackers and similar extruded snacks in Chinese supermarkets and nutrition labels.
memory
膨 (péng, 'to swell / expand') shows up across the same idea: 膨胀 (péngzhàng, 'to inflate / expand'), 膨大 (péngdà, 'to bulge'). Pair 膨 with -化 ('-ize') to get 'swell-ify' = puff up.
