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2. Hopper balloon - Wikipedia

   en.wikipedia.org/wiki/Hopper_balloon

   A pair of hopper balloons. A hopper balloon (simply hopper) is a small, one-person hot air balloon. Unlike a conventional hot air balloon where people ride inside a basket, there is no basket on a hopper balloon. Instead, the hopper pilot usually sits on a seat or wears a harness similar to a parachute harness. Hoppers are typically flown for ...

3. Balloon - Wikipedia

   en.wikipedia.org/wiki/Balloon

   Balloons are often deliberately released, creating a so-called balloon rocket. Balloon rockets work because the elastic balloons contract on the air within them, and so when the mouth of the balloon is opened, the gas within the balloon is expelled out, and due to Newton's third law of motion, the balloon is propelled forward. This is the same ...

4. Red envelope - Wikipedia

   en.wikipedia.org/wiki/Red_envelope

   A red envelope, red packet, lai see (Chinese: 利是; Cantonese Yale: laih sih), hongbao or ang pau (traditional Chinese: 紅包; simplified Chinese: 红包; pinyin: hóngbāo; Pe̍h-ōe-jī: âng-pau) is a gift of money given during holidays or for special occasions such as weddings, graduations, and birthdays. [1]

5. Balloon modelling - Wikipedia

   en.wikipedia.org/wiki/Balloon_modelling

   A balloon artist in Vienna, Austria A street performer doing balloon modeling in Japan, 2022. Balloon modelling or balloon twisting is the shaping of special modelling balloons into various shapes, often balloon animals. People who create balloon animals and other twisted balloon decoration sculptures are called twisters, balloon benders, and ...

6. Superpressure balloon - Wikipedia

   en.wikipedia.org/wiki/Superpressure_balloon

   A super pressure balloon in flight Flight profile of super-pressure balloons versus zero-pressure balloons. A superpressure balloon (SPB) is a style of aerostatic balloon where the volume of the balloon is kept relatively constant in the face of changes in ambient pressure outside the balloon, and the temperature of the contained lifting gas.

7. Envelope - Wikipedia

   en.wikipedia.org/wiki/Envelope

   An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...