A balloon (such as a hot-air balloon or weather balloon); an airborne bag filled with air or gas used for flight or observation.
休日に熱気球に乗って山々の景色を楽しんだ。
On the holiday I rode a hot-air balloon and enjoyed views of the mountains.
気象台は上空のデータを取るために観測用の気球を上げた。
The meteorological station released a weather balloon to collect upper-atmosphere data.
毎年秋に町で気球フェスティバルが開かれる。
The town holds a balloon festival every autumn.
子どもたちは空へ飛ぶ小さな気球を見て喜んだ。
The children were delighted to see small balloons flying into the sky.