Writing Notes: Breathing

I have a chap­ter in which my main char­ac­ter vis­its a cave. And while the air com­po­si­tion is dif­fer­ent from Earth’s air, it got me think­ing whether he would see a white cloud con­dens­ing from his breath. 

Hot breath increas­es the rel­a­tive humid­i­ty of the cold out­side air as they mix. Once humid­i­ty reach­es 100%, it results in breath con­den­sa­tion.

It may seem like a tiny thing when you describe set­ting & char­ac­ter, but it can pro­vide indi­rect infor­ma­tion to the read­er.

If you want to know whether your or your character’s breath will con­dense into a white cloud in cer­tain loca­tions, you can use this cal­cu­la­tor.

Jeno Marz
JENO MARZ is a science fiction writer from Latvia, Northern Europe, with background in electronics engineering and computer science. She is the author of two serial novels, Falaha’s Journey: A Spacegirl’s Account in Three Movements and Falaha’s Journey into Pleasure. Marz is current at work on a new SF trilogy. All her fiction is aimed at an adult audience.


  1. Cool! But yeah, I was beta read­ing for some­one who described pan­icked breath­ing as the heart rate slowed down… which I found con­fus­ing enough that I sug­gest­ed only men­tion­ing one. Didn’t know if it was accu­rate or not, but I just got stuck there and it pulled me out of the sto­ry.
    My recent blog post: 4 Tips to Escape the Slush Pile

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