Humidity is the amount of water vapor in the air. In daily language the term "humidity" is normally taken to mean relative humidity. Relative humidity is defined as the ratio of the partial pressure of water vapor in a parcel of air to the saturated vapor pressure of water vapor at a prescribed temperature. Humidity may also be expressed as absolute humidity and specific humidity. Relative humidity is an important metric used in forecasting weather. Humidity indicates the likelihood of precipitation, dew, or fog. High humidity makes people feel hotter outside in the summer because it reduces the effectiveness of sweating to cool the body by preventing the evaporation of perspiration from the skin. This effect is calculated in a heat index table.
( from WidipediA: Humidity)
Hygrometers are instruments used for measuring humidity. A simple form of a hygrometer is specifically known as a "psychrometer" and consists of two thermometers, one of which includes a dry bulb and the other of which includes a bulb that is kept wet to measure wet-bulb temperature. Evaporation from the wet bulb lowers the temperature, so that the wet-bulb thermometer usually shows a lower temperature than that of the dry-bulb thermometer, which measures dry-bulb temperature. When the air temperature is below freezing, however, the wet bulb is covered with a thin coating of ice and yet may be warmer than the dry bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. Relative humidity can also be determined by locating the intersection of the wet- and dry-bulb temperatures on a psychrometric chart. One device that uses the wet/dry bulb method is the sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes.
( from WidipediA: Hygrometer)
from the Herco web site
Dry Climate: Humidifiers are key to keeping your acoustic in good condition if you live in a dry climate. Acoustic guitars can and will shrink and/or crack when exposed to super dry climates, like here in Las Vegas or other desert environments. If although, you live in the desert and have had an acoustic for 10 years that hasn’t cracked, then you very likely won’t need a humidifier to protect it from cracking. You may be surprised though, what restoring a bit of moisture to the wood will do for the tone of the instrument.
28141 State Hwy 64
Canton, Texas 75103
Toll Free: (866) 500-2799
from the Kyser Musical Products web site
Since 1991, Kyser Musical Products has marketed the unique Quick Change capo. The ingenious design, performance and sturdy construction of the easy-to-use capo quickly caught on with musicians. Today it’s the best-selling product of its kind and the foundation of a company that grew out of a garage workshop to a worldwide presence applauded for the quality of its products.
from the Oasis Humidifiers web site
Hand-crafted in America, Oasis Humidifiers are the best solution to the challenge of guitar humidification. Whether you play a flat top steel string or a nylon string classical guitar, you have made a significant investment in a quality instrument. It is far less expensive to have an effective, easy to use guitar humidifier than it is to repair a cracked guitar. Give Oasis® a try and you will see how well it works!
J. D’Addario & Company, Inc.
595 Smith Street
East Farmingdale, NY 11735
from the Planet Waves web site
In 1994, Howard and Robert Silagy started a small guitar strap company in Hicksville, N.Y. Their approach to business was simple: make attractive, durable straps using high-quality materials and people will buy them. Over the next four years, the company grew, with sales skyrocketing because of the growing popularity of Planet Waves colorful, attractive designs and the line’s thick, heavy-duty leather tabs.
In 1998, D’Addario & Company, Inc. acquired the Planet Waves line and it joined D’Addario’s world-renowned family of musical instrument accessory brands. D’Addario envisioned the line as more than just accessories for guitarists, but for musicians as a whole.
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