in the air

The researchers examined the thermal performance of a TCM reactor powered by strontium chloride, which gives off heat as it reacts with water vapor in the air.

Another project from his past is up in the air.

Whether it will be a whisper-thin majority or a little more comfortable is still up in the air: Five seats have yet to be called, two of them in California.

“Lessons” include singing scales with one’s hands in the air, dropping on the high note, or bending forward and being pulled up by the ascension of notes.

"It’s all up in the air now," she tells the BBC.