How do you say “hot-air balloon” in Vietnamese?

Vietnamese words for “hot-air balloon”

• khinh khí cầuListennoun
  Hanoi [xïŋ˧˧ xi˧˦ kəw˨˩] · Saigon [kʰɨn˧˧ kʰɪj˦˥ kəw˨˩]khinh level khí rising cầu falling

  a hot-air balloon

  for “hot-air balloon” meaning: A balloon-shaped aircraft whose bag is inflated with hot air, carrying passengers and crew in a gondola slung underneath.

• khí cầuListennoun
  Hanoi [xi˧˦ kəw˨˩] · Saigon [kʰɪj˦˥ kəw˨˩]khí rising cầu falling

  a weather balloon

  for “hot-air balloon” meaning: A balloon-shaped aircraft whose bag is inflated with hot air, carrying passengers and crew in a gondola slung underneath.