The effect of grain size and moisture on the popping expansion of popcorn was evaluated for the cultivar South American Mushroom, produced in 1984/85, in Campinas, São Paulo, Brazil. Grain size classes ranging from 14/64 to 18/64 inch, and moisture contents from 9.4 to 19.8% were studied. The results indicated a higher expansion rate for the smaller grains and for moisture contents between 10.5 and 11.5%.
popcorn; grain size and moisture; popping expansion