thin air

Used in 'vanish into thin air' to mean disappear suddenly and completely.

• My keys seem to have vanished into thin air this morning.
  Anahtarlarım bu sabah sanki buhar olup uçtu.
• The money seemed to disappear into thin air after the holiday.
  Tatilden sonra para sanki buhar olup uçtu.

Used in 'out of thin air' to mean from nowhere, without any clear source.

• A taxi appeared out of thin air just as it started raining.
  Yağmur başladığı anda birdenbire bir taksi belirdi.
• You cannot just invent these numbers out of thin air.
  Bu rakamları öylece hiç yoktan uyduramazsın.

Air at high altitude that contains less oxygen than normal.

• The thin air at high altitudes makes breathing difficult.
  Yüksek irtifalardaki seyrek hava nefes almayı zorlaştırır.
• Climbers often feel tired and dizzy in the thin air.
  Dağcılar seyrek havada sık sık yorgunluk ve baş dönmesi hisseder.