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Re: A success story

Posted by ChuckS on December 20, 2001 at 10:29:08:

In Reply to: Re: A success story posted by Cue Miller on December 20, 2001 at 10:01:28:

A bit of clarification. Warming the humidifier increases the humidity, since more water evaporates. Warming the air in the hose won't. It will have the same amount of water vapor, but the relative humidity (RH) will be lower. RH is the ratio of the water vapor in the air to the amount of water vapor the air is capable of holding at a particular temp. Increasing the temp means that the air can hold more water vapor, so the same amount of water vapor becomes a smaller percentage of the amount the air can hold, and therefore lower humidity.

It's like if you have a cup of water in a 1 cup container, it's 100% full. If you put the water into a 2 cup container, it's only 50% full.

If the water coming out of the heated humidifier is 100%, and you warm it, it will be less than 100%. If it's cool and 100% when it gets to your nose, etc, and the nose, etc warms it, it will also become less than 100%, except that the nose, etc adds moisture.

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