what is the envelope of a hot air balloon made of
Hot air balloon Modern hot air balloons are usually made of materials such as ripstop nylon or dacron (a polyester).[19]
Paris Peace Accords
Bubble Tape The white powdery substance on the gum is most likely cornstarch, which is used to prevent drying and sticking to itself.
Bull riding The flank strap
Popcorn Popcorn, or pop corn, is a variety of corn kernel, which forcefully expands and puffs up when heated.
Boyle's law where P is the pressure of the gas, V is the volume of the gas, and k is a constant.