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Twisting balloons can be used to create decor centerpieces for events and to create a more unique look than can be provided by foil balloons. Often the term "party balloon" will refer to a twisting balloon or pencil balloon. These balloons are manipulated to create shapes and figures for parties and events, typically along with entertainment.
Wikipedia: Featured picture candidates/Technical Drawing of Historical Hot Air Balloon Designs
Thermal image showing temperature variation in a hot air balloon. The density of air at 20 °C (68 °F) is about 1.2 kg/m 3 (0.075 lb/cu ft). The total lift for a balloon of 2,800 m 3 (100,000 cu ft) heated to 99 °C (210 °F) would be 723.5 kg (1,595 lb). This is just enough to generate neutral buoyancy for the total system mass (not including ...
The Union Army Balloon Intrepid being inflated from the gas generators for the Battle of Fair Oaks. Hot air balloons were employed during the American Civil War. [46] The military balloons used by the Union Army Balloon Corps under the command of Prof. Thaddeus S. C. Lowe were limp silk envelopes inflated with coal gas (town gas) or hydrogen.
A balloon modeler's toolkit contains hundreds of colorful balloons in various sizes and hues. Musician St. Vincent wearing a balloon hat in 2015. Modellers will use an assortment of balloons, usually in various colors. Balloon sizes are usually identified by a number: the most common size of twisting balloons is called a "260", as it is ...