Explore Giant-sized solar science fun! This 50 foot long balloon soars high in the sky powered by the sun. Learn about buoyancy, convection, thermodynamics and solar power. Teaches Bernoullis Principle and Pascals Principle. Great for science classes and the perfect start to a science project. Bright direct sunlight inflates the Solar Balloon automatically in just minutes. Includes one 50 foot long by 29" diameter Solar Balloon, 400 feet of string, complete instructions and science learning guide.