My apartment seems so dry, what's an ideal indoor humidity level?
104004
Generally between 30% and 50% RH is normal and comfortable for the winter. A decent hygrometer / thermometer available at a local discount or department store will give you a fairly accurate reading.
1176440
It is too dry in your house ??? try putting a pot of water on your stove top and put it on low and let it evapoate into your house ..
899553
I got the Vick's cool air humidifier.  (the cool air is supposed to be better)   I think it was about $30 and works pretty well.\n\nI wouldn't' think that trying to make one at home would be a good idea.  Something about sticking my head over a hot pot of water just doesn't sound safe.
1105293
l would advise you to sleep with neither.\nNatural cross ventilation is best,even in hot climates.Sleepwear should be light and please use mosquito netting for your doors and windows.\nWhile the other answerer is right about dehumidification,certain fungi and micro-orgasnisms thrive in conditioned air,especially in large hotels,like Legionnaire's disease.-this is caused by a bacterium called Legionella  pnuemophilia which thrives in air -conditioning vents.\nFans cause a lot of dust mites  to swirl about,especially in an enclosed space,causing allergic reactions and increased susceptibility to infections.\nSo stay natural -open windows,natural night breezes.
451571
I guess if the humidity is so bad that the patching plaster won't dry... but it sure sounds odd.
550764
If this is a constant problem then buy a humidifier. Static electricity is less likely to happen if the air in your house is not so dry.
316385
I used to live in Bermuda and it was extremely humid. I had to use 1/4 teaspoon more vinegar.
676222
as the air cools it cannot hold the same amount of moisture as the warm daytime air can. as the result, the moisture is released and we feel this as humidity.\n\nhumidity is the amount of moisture in the air relative to the temperature. 30% humidity means that at that temperature, the air contains 30% of the total amount of moisture it can hold. as the temperature drops, the air cant hold as much moisture.
854393
to increase humidity so nothing dries out\n\nlike a cigar humidor
576407
1. Heat\n2. Lower the humidity\n3. Air movement\n4. Lower barometric pressure\n5. Some combination of above
721426
OBVIOUSLY the 46 is 46C not 46 F!!!!!!!!!!!!!!!!! And I would think that an AC is for some reason unavailable. Without an AC you will have to try to minimize the amount of heat transfer coming into your apartment. Since you are in the top floor the radiant heat from the sun is the biggest factor. The best way would be to set up a mirror on your roof but you probably don’t have one that size so try spreading out a few rolls of aluminum foil. Try to cover as much area as you possibly can. This will reflect most of the radiant heat from the sun. Construct a shade over your windows such that the direct rays of the sun do not come into your apartment. You may want to get a fan and try to take advantage of the principle of evaporative cooling. Depending on the humidity it will be an very effective method of keeping cool. Use the fan instead of depending on the breeze. If you cant get a fan do as instructed above wet your WHITE curtains.
910516
When it's cold enough and when there is enough moisture in the air
1098013
humidity - if you go look under the general science and mathematics category then the question next to yours is very similar. Saunas are definitely over 70C, I've been in one in Finland that was about 80C, they like theirs HOT. You have to sit on a thick towel or you would burn your skin when you sat down. Turkish baths are the steamy ones aren't they? They are definitely not 70C, you'd die. They are probably about 30-35C but they feel just as hot because of the humidity. \n\nWhen your body needs to cool down you sweat, and as the sweat evapourates it cools the skin. If you are in humid air at 30C the sweat can't evapourate much as the air is already full of moisture so you feel hotter. In a sauna the air is very dry and the sweat evapourates so you don't feel as hot. \n\nIf you want to test this, the simple way is to go in a sauna, get comfortable, then chuck a scoop of water on the rocks so it goes to steam. Chuck on a few scoops and you will be out of there pretty quick.\n\nI should also point out that although you feel hot, your core body temperature would hardly change - we are very good at controlling that so long as we get out of the heat when we feel we really need to.
995634
Low.\n\nHigh pressure tends to be dry, while lows suck moisture in.
132761
Use dry ice. It is always -78 or colder.
463069
1. Is your tent waterproof???( Did you spray it?)\n\n2.Was it on a ground cloth?\n\n3.Transpiration of the people inside will cause moisture on the inside walls of your tent, but it shouldn't cause so much dampness that should worry anyone.\n\nAlso if to were camping while temperatures where below freezing during the night, this could have caused alot of your problem.\n\nWhen camping you have to leave the door open a bit in the winter type months to prevent suffocation.\n\nMight have been your problem.
71300
Nice question, most people unless they are weather buffs or cigar afficianados don't know about hygrometers.\n\nHygrometers measure relative humidity, or how damp or dry the air is.\n\nThere are digital and analog hygrometers.\n\nCalibration (adjusting for accuracy) of both is difficult for various reasons. To calibrate a hygrometer means you need an  accurate reference which provides accurate relative humidities over a range of air temperatures and pressures. It is not enough to calibrate a hygrometer at  just one point. \n\nMost analog (dial) hygrometers only allow you to set one point by twiddling the fixed dial until the needle is pointing to the current moisture level.\n\nMost inexpensive digital hygrometers do not have calibration controls. The next price level up only allow you to set offset and scale - this is so-called "linear calibration" and it is not much better really.\n\nDepending on what you are measuring, one of the easiest ways to make your own accurate hygrometer is  with two accurate but inexpensive lab thermometers. See the link on how to make a wet bulb hygrometer.\n\nCheap hygrometers are easy to find on auction sites like ebay or yahoo, and using Googles Froogle search.