Wiki User
∙ 14y agoA sling psychrometer an instrument that measures relative humidity (a hygrometer). The sling has two thermometers, a dry bulb and a wet bulb thermometer, mounted together on a chain. The wet bulb thermometer is wrapped in muslin that is moistened with distilled water. The user then swings the sling until the temperatures stabilize, then quickly notes the two temperatures. To interpret the readings and determine the humidity, a chart is then used for the specific altitude at which the reading was taken. Basically, the drier the air is, the more moisture evaporates from the moistened muslin-covered thermometer, and the greater the difference between the two thermometers. If the relative humidity is 100%, then the two temperatures will be the same.
Slings have been around for years, and are becoming less and less used for many reasons. With the advent of digital hygrometers, it's just easier to pull out a device and read the screen. Additionally, besides being cumbersome and time consuming, slings contain Mercury, a hazardous material, and must be handled with care. A sling will typically read 5-10% high due to user error. Some of the mistakes that can be made while using a sling are:
1. If the sock on the wet bulb thermometer is not clean, the humidity measured from a sling will err on the high side.
2. If the water used for the wet bulb thermometer is not distilled water, the humidity measured from a sling will err on the high side.
3. If the sling is not swung around long enough, the humidity measured from a sling will err on the high side.
4. If the thermometer measurements are not read quickly enough after swinging the sling, the humidity measured from a sling will err on the high side.
5. If the charts used to interpret the results are not for the same altitude where the readings were taken, the humidity will be incorrect. Additionally, the charts are only available in 100' increments, and it is often difficult to determine the exact altitude of the user.
Wiki User
∙ 14y agoA sling psychrometer (or hygrometer) uses the difference in readings between a wet bulb thermometer and another with a dry bulb to measure the relative humidity. The bulb that is wet will cool by evaporation to the "dew point", which is the temperature at which the current humidity would be the maximum possible. Comparing that to the dry bulb (the general air temperature) on a comparative chart will yield the approximate relative humidity.
Relative humidity expresses a percentage of humidity in the air to the maximum amount of humidity that could be in the air. For example: when the temperature rises the air will be able to hold much more humidity so the relative humidity will drop.
This is an instrument used to measure the relative humidity in the air.[Another way of determining this is to measure the dew point of the air. The temperature at which dew will form on a clean mirror that can be chilled. ]
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A sling psychrometer (or hygrometer) uses the difference in readings between a wet bulb thermometer and another with a dry bulb to measure the relative humidity. The bulb that is wet will cool by evaporation to the "dew point", which is the temperature at which the current humidity would be the maximum possible. Comparing that to the dry bulb (the general air temperature) on a comparative chart will yield the approximate relative humidity.
Psychrometers are used for measuring the dew point and relative humidity which you have to have a chart to find and finding the relative humidity in controlled environments
DA site your sources when you put stuff on here DA!It measures the moisture content or relative humidity of the air...............http://www.thefreedictionary.com/psychrometer
A sling psychrometer (or hygrometer) uses the difference in readings between a wet bulb thermometer and another with a dry bulb to measure the relative humidity. The bulb that is wet will cool by evaporation to the "dew point", which is the temperature at which the current humidity would be the maximum possible. Comparing that to the dry bulb (the general air temperature) on a comparative chart will yield the approximate relative humidity.
measure relative humidity presure and new point
Relative humidity is reported in percentages. The percentage relates to the amount of water vapor air of a given temperature holds when it is saturated. So the humidity is reported as 50%, if the amount of water vapor in the air is half of what the air could hold at its current temperature.
This is the temperature at which small spheres of dew will form on a smooth surface. As such it is a measure of relative humidity. It is also used as a measure of the goodness of desiccant materials such as P2O5, and CaSO4. i.e. the lowest relative humidity to which this material will dehydrate.
A hygrometer measure humidity. One sort of hygrometer is psychrometer, it has two thermometers one kept wet the other dry. The difference between the temperatures is related to the humidity.
Relative humidity expresses a percentage of humidity in the air to the maximum amount of humidity that could be in the air. For example: when the temperature rises the air will be able to hold much more humidity so the relative humidity will drop.
When the relative humidity and dew point temperature are the same they form clouds.
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The relative humidity of the air is a measure of how much moisture is in the air compared to the maximum amount of moisture the air can hold at a given temperature. It is expressed as a percentage and indicates how close the air is to reaching its saturation point.