汽

Glyph origin
.

Alternatively, an - steam. Quite possibly both of these origins could be true, out of convenience.

Etymology 1
From.

Definitions

 * 1) gas
 * 2) steam; water vapor

Definitions

 * 1)  to tear (to produce tears)
 * 1)  to tear (to produce tears)

Kanji

 * 1) steam, vapour
 * 2) nearly

Readings
As variant kanji for :

Affix

 * 1) steam; vapor