Quote:
Originally Posted by kevman
The humidity in our garage this week has been around 10% - everything dries fast at that level!
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Sure. The humidity will be greater as the snow and crap stuck to the car is melting and all that 'drying' (ie: evaporation) is taking place. Relative humidity as a measure is only comparable given the same air temperature.
Let's assume you're like most people with attached, heated, insulated garages, and have a single thermostat and furnace keeping your garage at the same temperature as your home, that temperature being 21°C. It's
probably set warmer given the temperatures we've had, but what the hell, 21°C is a common ambient temperature estimate. 21°C, relative humidity of 10%. Peachy.
It's -10°C outside with a relative humidity of 66%.
Holy balls, it must be
really humid.
Not when you convert relative humidity to
actual humidity.
10% humidity at 21°C works out to an absolute humidity of 1.8328 g/m³.
66% humidity at -10°C works out to an absolute humidity of 1.5572 g/m³.
There is still more humidity in your garage at 10% relative humidity. Your garage would need to be 18°C for the absolute humidity to be less than it is outside. And keep in mind the colder it is outside, the less absolute humidity that outside air can hold.
... Wait, why the hell am
I doing all this, where the f--k is MathGod?