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I'm not sure if this is the right place to ask. I have a humidifier, and a closed room. Basically, I want to know the required water to reach a certain level of humidity.

My room volume is 42 meter cube. I want to know how many liters are required to get to xx% humidity. What's the equation used and if water/humidity is a linear equation.

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closed as off-topic by akhmeteli, David Z Aug 30 '13 at 18:51

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See our meta site for more guidance on how to edit your question to make it better" – David Z
If this question can be reworded to fit the rules in the help center, please edit the question.

Hadn't you asked this same question before? . Please note that Homework questions are supposed to supposed to show more effort. For more details, please see the Homework Policy. – centralcharge Aug 30 '13 at 16:00
No I just signed up. And this is not a homework (not sure why you think it is). I have a humidifier, and I think its humidistat is not working correctly, so I want to make the math on my own. – Omar Abid Aug 30 '13 at 16:32
It doesn't need to be real homework. See the linked homework policy. I guess someone else had asked a similiar question, then. – centralcharge Aug 30 '13 at 16:40
First you'll need the height of the room, to get the volume... – DJohnM Aug 30 '13 at 18:31

Find the volume of the room in cubic meters. Measure the temperature of the air.

Find a table of "Moisture Content of Saturated Air", or "Maximum Moisture Content of Air" vs Temperature.

Multiply the appropriate value from the table at the room temperature by the volume by the RH, to obtain the grams of moisture in the room...

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