About of RELATIVE HUMIDITY
humidity control chamber, environmental chambers, temperature ...
Site offers humidity control systems for self contained chambers, environmental
rooms and generating units.
Humidity Control Chamber Stability Rooms and Environmental Rooms Stability Chambers: Constant Relative Humidity Humidity Control Chambers Stability Chambers, Stability Rooms, and Environmental Chambers by Parameter Generation & Control
Parameter Generation & Control (PGC) specializes in humidity control chambers and environmental chambers by providing precise relative humidity and temperature control with walk-in rooms, reach-in chambers, and relative humidity generators to serve existing structures
Precise humidity control systems are our specialty
Our products include: Stability chambers and stability rooms for the pharmaceutical industry that exceed ICH guidelines in regards to temperature and relative humidity control
Temperature humidity chambers and temperature/relative humidity generating units for mini-environments within the Semiconductor industry
Environmental test chambers for temperature and relative humidity calibration utilizing chilled mirror technology
Relative humidity calibrations chambers to the Metrology industry for relative humidity and temperature sensor calibration
Relative Horsepower Calculator
JavaScript calculator to determine how altitude, barometric pressure, dewpoint
and temperature affect the horsepower of an internal combustion engine.
There is also a which uses the values of temperature, absolute pressure and relative humidity
Engine Tuner's Calculator Air Temperature degrees F Altimeter Setting inches Hg Dew Point degrees F Altitude feet Relative Horsepower % Air Density kg/m 3 Relative Air Density % Density Altitude feet Virtual Temperature deg F Absolute Air Pressure inches Hg Vapor Pressure inches Hg Relative Humidity % Dyno Correction Factor Copyright 1998-2004, The atmospheric pressure, temperature and humidity all affect the density of the air
This calculator uses the dewpoint temperature rather than relative humidity because the dewpoint is essentially constant for a given air mass
On the other hand, the relative humidity changes radically during the day as the air temperature changes
For the SAE J1349 relative horsepower calculations, the standard reference conditions are: Air temp 77 deg F (25 deg C), 29.235 Inches- Hg (990 mb) actual pressure and 0% relative humidity
The ICAO standard conditions for zero density altitude are 0 meters altitude, 15 deg C (59 deg F) air temp, 1013.25 mb (29.921 in-Hg) pressure and 0 % relative humidity
Density Altitude Calculator - English
JavaScipt calculator for pilots. Determines density altitude from the altitude,
air temp, altimeter setting and relative humidity.
Air density is affected by the air pressure, temperature and humidity
The engine tuner's calculator includes relative horsepower, air density, density altitude, virtual temperature, absolute pressure, vapor pressure, relative humidity and dyno correction factor
This calculator uses dew-point rather than relative humidity because the dew point is fairly constant for a given air mass, while the relative humidity varies greatly as the temperature changes
The ICAO International Standard Atmosphere standard conditions for zero density altitude are 0 meters (0 feet) altitude, 15 deg C (59 deg F) air temp, 1013.25 mb (29.921 in Hg) pressure and 0 % relative humidity (absolute zero dew point)
Basic Guidelines for the Care of Special Collections
Care of objects within special collection, with steps for conservation, environment
and finding professional assistance. From the AIC.
High light levels, drastic humidity fluctuations, and pests can be especially damaging to organic materials
Excessive humidity may cause molds and fungi to grow on certain organic materials
The Environment and Your Collection The major environmental factors that affect the long-term preservation of objects are light, relative humidity, temperature, air pollution, pests, and human error
Relative humidity refers to the amount of moisture in air
These materials tend to be more stable in a moderate relative humidity (45%-55%), a condition rarely present in normal exterior or interior environments
Inorganic materials usually are not affected by relative humidity levels unless they contain salts or are otherwise unstable
Metals, however, are best preserved at low relative humidity
Serious damage can occur when materials are subjected to dramatic, sudden changes in relative humidity over short periods
Prolonged exposure of organic materials to relative humidity above 60% - 65% will encourage the growth of molds and fungi
Temperature is significant because it affects relative humidity
info: RELATIVE HUMIDITY
Photo by weather.unisys.com
Caring for Textiles
Effects of environmental factors, including light, temperature and humidity, and
pollution, and proper storage and housekeeping of textiles. From the AIC.
The specific factors affecting degradation are light, temperature and relative humidity, dust, and pollutants
Temperature and Relative Humidity Higher temperatures accelerate the rate of chemical reactions, speeding up the degradation of fibers, dyes, and contaminants
Relative humidity is a measure of the moisture in the air
Because all organic materials contain moisture, fluctuations in temperature and the resulting changes in relative humidity will cause objects to expand and contract
Other problems associated with high relative humidity are bleeding dyes and corroding metals
Relative humidity should be kept as constant as possible between 35% and 70%, avoiding desiccation of textiles at the lower end and blooming of mold growths at the upper
Avoid tightly sealed cases, plastic bags, or frames, since they can trap damaging vapors and provide an environment associated with high humidity problems
Louisiana Agriclimatic Information
The LSU AgCenter's statewide network of electronic weather stations.
All Rights Reserved | Best viewed in Newton, MS / Newton Observation Time: 22:30 (CST) Age Of Record: 0 mins Air Temperature: 66 °F Today's Rain: 0.43 inches Relative Humidity: 87 % Wind Speed: 2.6 mph Wind Direction: 315 deg Air Pressure: 29.70 In
Gabriel Observation Time: 22:21 (CST) Age Of Record: 9 mins Air Temperature: 12, 630 °F Today's Rain: 0.14 inches Relative Humidity: 65 % Wind Speed: 10.4 mph Wind Direction: 0 deg Air Pressure: 29.96 In
Hg Solar Radiation 0.00 kW/m 2 Soil Temperature: 82 °F Livingston / LIGO west Observation Time: 22:26 (CST) Age Of Record: 4 mins Air Temperature: 72 °F Today's Rain: 0.04 inches Relative Humidity: 76 % Wind Speed: 2.6 mph Wind Direction: 19 deg Air Pressure: 29.88 In
Hg Solar Radiation 0.00 kW/m 2 Soil Temperature: 79 °F Livingston / LIGO south Observation Time: 22:29 (CST) Age Of Record: 1 mins Air Temperature: 72 °F Today's Rain: 0.00 inches Relative Humidity: 79 % Wind Speed: 3.3 mph Wind Direction: 354 deg Air Pressure: 29.98 In
Hg Solar Radiation 0.00 kW/m 2 Soil Temperature: 80 °F Monroe / ULM Observation Time: 22:29 (CST) Age Of Record: 1 mins Air Temperature: 65 °F Today's Rain: 0.26 inches Relative Humidity: 77 % Wind Speed: 4.5 mph Wind Direction: 83 deg Air Pressure: 30.03 In
The Common Cold, NIAID Fact Sheets
Fact sheet with general information, including causes, symptoms, prevention and
treatment.
Seasonal changes in relative humidity also may affect the prevalence of colds
The most common cold-causing viruses survive better when humidity is low-the colder months of the year
Science News Online - Past Issues - 4/27/96
An article about the problems with preserving the monuments in the Wieliczka Salt Mine.
Money came through to fund two separate studies--one focusing on humidity and the other on pollution--both led by U.S
Explains conservation chemist Roman Kozlowski of the Polish Academy of Sciences in Krakow, "at the beginning, we knew little about methods for studying microclimates, " such as how temperature, humidity, or airflow may vary within a single room
Pure rock salt does not begin picking up water until the relative humidity reaches about 75 percent
While the humidity deep in the mine oscillates seasonally between about 55 and 65 percent, Kozlowski and Hosker found that the relative humidity in the chapel can reach periodic, midweek highs of 75 percent by April--and by July it stays at that level around the clock
To investigate whether crowds of visitors--with their warm, hot breaths--might pose an independent risk to the sculptures, Kozlowski's team studied humidity changes in small chapels deep within the mine as tourist groups filed through
This pollution also accelerated the moisture buildup by changing the surface chemistry of the salt in such a way as to lower significantly the relative humidity at which it begins to dissolve
Benefits
Photo by www.logicbeach.com
Wood Furniture Care, Protection & Repair - Bedroom Furniture Care and repair tips for wood and fabric.
 Heat, Humidity and Hardwoods Did you know that up to half the weight of freshly sawn wood is water? Hard wood furniture is crafted from wood that is carefully dried, retaining just enough moisture for the furniture to properly acclimate to the relative humidity in your home
The wood in furniture continues to exchange moisture with the air, shrinking and expanding in response to changes in relative humidity
This will correct itself as the relative humidity rises, and the hardwood absorbs enough moisture to expand slightly
 On the other hand, if you don't have an air conditioner or dehumidifier, your home's relative humidity may get too high
Once again, this will correct itself as your home's relative humidity decreases
 Here are some ways to ensure your solid hardwood furniture's longevity:  For your comfort, as well as to protect your hardwood furniture, use a humidifier in the winter and an air conditioner in the summer to keep the relative humidity at 25 to 35 percent
Keep them in an upstairs closet rather than in a damp basement, so that the table leaves are adjusting to the same relative humidity
Dust Mites
Fact sheet on controlling dust mites, which are second only to pollen in causing
allergic reactions.
This is not necessary because dust mites need about 70 percent relative humidity or higher to live, and they need food
Reducing humidity in the home by using a dehumidifier may help reduce populations, but reducing humidity levels in microclimates, such as in bed fibers or carpet fibers, is impossible
Inteltronics Instrumentation Meteorological Instrumentation ...
Supplier of Meteorological Instrumentation in South Africa and Africa.
Specification Height Tube material Galvanizing Total shipping weight Total shipping dimensions Concrete slab (if required) 9 meters Galvanized steel Hot dipped to ISO 1461 80 kg 2100 x 300 x 300 mm 6 x 6 meters or 3 1x1 meters More info for specification sheets or product range just click (or see Sensor Mounts) Description The model 41003 Gill Multi-Plate Radiation Shield protects temperature and relative humidity sensors from error-producing solar radiation and precipitation
Construction Dimensions Accommodates temperature and humidity sensors up to 26 mm diameter
13 cm D x 26 cm H More info for specification sheets or product range just click (or see Temperature & Humidity) Description The model 05103 Wind Monitor is a high performance, rugged wind sensor
for specification sheets or product range just click (or see Wind Sensors) Description The model 41382 Relative humidity / temperature probe combines a high accuracy, capacitance type humidity sensor and 1000 ohm Platinum RTD temperature sensor in one probe
R.M.Young Model 41382 Relative humidity/ temperature sensor
Specification Power required V option :10-28 VDC 5 mA L option : 10-28 VDC 20 mA Calibrated measuring range Time constant Accuracy at 0 deg C Sensor type Output signal -50 to 50 deg C 42 seconds with model 43408 aspirated shield +- 0.3 deg C 1000 Ohm Platinum RTD 0-1 VDC (V option) 4-20 mA(L option) More info for specification sheets or product range just click (or see Temperature & Humidity) Description The model 41382 Relative humidity / temperature probe combines a high accuracy, capacitance type humidity sensor and 1000 ohm Platinum RTD temperature sensor in one probe
Bush Fires Wild Fires Australian bushfires wildfires photographs ...
Reports and photographs from major bushfires in Australia, as well as a historical
list.
The Fire Danger Index is calculated from a combination of temperature, relative humidity, wind speed, drought and the amount of available fuel that can burn is a given area
Low relative humidity, high winds and lack of rain all contribute to increased fire danger
Relative humidity is the most commonly used measure of atmospheric moisture and is defined as the ratio of the amount of water vapour actually measured to that which air could hold at saturation
Very low relative humidity of, say, less than 20 per cent, causes fuels to dry out and become more flammable
Weather systems like the highs, lows and cold fronts that appear on weather maps control the temperature, humidity and wind
RELATIVE HUMIDITY ?
Portable dehumidifiers, heating, air purifiers and air ...
Humidity and light monitoring and control.
Meaco (U.K.) Limited are the leading supplier of , to control relative humidity, Condensation, Mould, Moisture, Temperature and Damp
NEDCC TECHNICAL LEAFLET, SECTION 3, LEAFLET 9 - EMERGENCY SALVAGE ...
Basic stabilization techniques of small to medium mold outbreaks in paper collections.
Moisture in the air is measured as relative humidity (RH)
The only wholly dependable control strategy is to keep the humidity and temperature moderate so the spores remain dormant, keep collections as clean as possible, and prevent the introduction of new active mold colonies
BASIC PRINCIPLES OF SALVAGE REDUCE THE HUMIDITY: As noted above, moisture initiates mold growth
Reducing the humidity is essential to stopping the mold growth
If there is no obvious source of moisture, use a monitoring instrument to measure the relative humidity in the affected area
If the humidity is elevated, there might be a problem with the HVAC (heating, ventilating, and air conditioning) system, or the area might be subject to higher humidity for another reason, such as having shelves placed against an outside wall
Bring in fans to circulate the air, and open the windows (unless the humidity is higher outside)
Your goal should be to reduce the relative humidity to 55% or lower
Get a monitoring instrument that can measure the relative humidity and temperature accurately, and record the measurements in a log several times a day
Directory of environmental chamber manufacturers and suppliers ...
Provides a list of manufacturers and suppliers.
Houston, TX 800-840-5778 Since 1967, industry leader in turnkey walk-in environmental test chambers, stability chambers, dry rooms, temperature/humidity test chambers, cold/warm rooms, burn-in chambers and low humidity chambers
Precision temperature and humidity control with worldwide installations at Fortune 500 companies
Cincinnati, OH 513-772-8810 Cincinnati Sub-Zero, CSZ, manufactures Environmental Chambers, Life Science Chambers for Biological and pharmaceutical storage, Walk-In Chambers, Altitude Chambers, Chillers and Industrialized Freezers Black Mountain, NC 28711 800-438-5494 Parameter Generation & Control (PGC) specializes in environmental chambers by providing precise relative humidity and temperature control with walk-in rooms, reach-in chambers, and relative humidity generators to serve existing structures
Some products include bench top and walk-in chambers, thermal shock chambers, temperature chambers and humidity test chambers
Hudsonville, MI 49426 616-878-0270 ESPEC provides environmental test chambers for quality assurance testing of products in temperature and humidity extremes
Cleveland, OH 44102 888-456-0643 Singleton Corporation's product line includes chambers for static, cyclic, fog, spray, humidity, dry, ambient immersion, and dust type tests
CURRENT WEATHER
Current data and forecasts, also information on other earth science observations.
Links to publications and education (some pages only available in full Chinese ...
Current Weather | Bulletin issued at 12:02 HKT 25/Sep/2006 AT NOON AT THE HONG KONG OBSERVATORY THE AIR TEMPERATURE WAS 28 DEGREES CELSIUS AND THE RELATIVE HUMIDITY 67 PER CENT
Desiccators, Desiccant Dry Cabinets, Dry Box Storage - Totech America
Desiccant dry cabinet supplier. Capable of maintaining constant 1-50% RH levels
via a digital control panel, without the use of nitrogen.
| Auto-Recycling Desiccant Dry Box Ultra-low relative humidity (RH) storage for, and
Totally self-contained, nitrogen (N2) unnecessary! Use Totech Desiccant Dry Cabinets for: * Ultra-Low RH storage (1-50% RH) of MSDs (moisture sensitive devices) * Low Humidity storage of photographic and optic lenses * Constant relative humidity storage of materials in a laboratory environment What is a Desiccant Dry Cabinet? A Dessicant Dry Cabinet is an enclosure with a supply of desiccant which maintains an internal environment of 1-50% RH
Desiccant dry cabinets are also called: desiccators , dry boxes , dehumidifying cabinets , and ultra low humidity storage cabinets
When an item that contains moisture, even trace amounts, is placed within a low humidity ('dry') environment, the moisture will slowly be released from the item into that 'dry' environment
The reality is that the dry cabinet's RH level (relative humidity) is so low that the air inside will act as a magnet to the trapped moisture inside your items, and it will draw it out, into the air within the desiccator
Our SUPER DRY and AUTO DRY cabinets are also called desiccators, dehumidifying cabinets and ultra-low humidity desiccators
Predicting Weather
Provides a look at the tools needed to predict the weather.
Psychrometer Psychrometers, or wet bulb thermometers, measure relative humidity
Then the temperatures on the two thermometers are compared on a special chart to find the relative humidity
Often, the relative humidity is the weather condition that makes people the most uncomfortable
Sencera Relative humidity sensor, Resistive humidity sensor, Air ...
Manufacturer of shock, tilt, gas and humidity sensors from Taiwan.
ICM: Weather forecast
48 Hours Weather Forecast for Poland.
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