Katara can pull some water vapor from the air, but there’s no canon number like “X liters.” In Avatar , it’s shown as a technique a skilled waterbender can use in low-water situations, but the amount depends on humidity, location, and how much bending power they have.

What that means

  • In a humid place, she could probably gather more water from the air.
  • In dry air, she’d get very little.
  • The series does not give an exact liters-per-minute or liters-per-second limit for Katara specifically.

Rough takeaway

If you want a simple answer: there is no official fixed number of liters for Katara pulling water from the air. It’s best thought of as a small-to- moderate environmental source, not a huge endless supply.

Forum-style shorthand

“Out of thin air” is a cool fan phrase, but it usually means moisture in the air, not literal empty air being turned into water.

TL;DR: No canon exact amount exists; it depends on humidity and the scene.