what temperature does it need to be for our breath to show in the air?

Question

smoke from breath in cold weather

Answer 1

Attached is a good website for explaining this. The temperature needed for breath to show is highly dependent on the relative humidity of the outside air. Assuming that air from the lungs always leaves with a temperature of 95 F (35 C) and an RH of 95%, this will never happen above 81 F (27 C) and will always happen below 46 F (8 C). In reality, the temperature of exhaled air varies with temperature, so your actual milage will vary.

Answer 2

Why can you see your breath when it's cold outside? (breathing)

Your breath is reasonably warm and humid (i.e., it has invisible water vapor as a large component of the gas). Warm moist air meeting the cooler air outside the body causes the invisible water vapor to condense into small droplets (fog, cloud) which are visible. The relative humidity which depends upon water content and temperature goes to 100%. As the breath gets further from the person's face the water content dilutes and the relative humidity goes down and the droplets go back into vapor form. (Ben Doughty, Ph.D., Department of Physics, East Texas State University, Commerce, Texas)

It has to do with the "dew-point." On some days when you go outside after a cool night, you will see water on the grass. The temperature has dropped below the "dew-point" and allowed water to condense. When you see your breath, you are seeing the water droplets in your breath condense. The air has to be cool to do this, but there's no set temperature because it also depends on what the air pressure is. (Christine Brunello, Don Harrington Discovery Center, Amarillo, Texas)

Answer 3

Usually when temperatures reach the mid to lower 40s.

Answer 4

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Answer 5

usually in the low 50 high 40s

Answer 6

It's not just a function of temperature it also has to do with humidity and dew point. So there's no one answer for this.

Answer 7

i'd have to say around 30 degrees F or so. When it is in the upper 30's, you can just barely see it, but 30 degrees is when you can clearly make it out

Answer 8

roughly 42 degrees F

Answer 9

it has to be less than 10 degrees centigrade(approx)