WHY DOES POPCORN POP?
Quality popcorn has a moisture content of 13-14% inside the hull. When the popcorn is heated the moisture turns to steam and expands. Eventually the pressure from the expanding steam causes the hull to explode. Storing popcorn in a sealed container at room temperature or less will keep the moisture content consistent and the popcorn fresh. Avoid storing popcorn in extremely warm and dry conditions which will cause the moisture content in the popcorn to reduce. A loss of as little as 3% moisture can cause the kernel to become un-poppable (an old maid).