Why You See
Your Breath on a Cold
Winter Night
Condensation
can occur if moist, warm air mixes with cold, dry air.
Temp RH SVP VP
Air
0oC 20% 6 mb 1
mb
¥ (clear)
Breath
36oC 80% 63 mb 55
mb
¥ (clear)
50-50
18oC 140% 20 mb 28
mb (cloud)
90-10
4oC 90% 8 mb 6
mb
¥ (clear)
The
50-50 mix condenses into a cloud that quickly evaporates
as your exhalation is diluted furtherAhrens Fig. 4.5
Breath
Air
50-50
90-10