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In Army lingo what does wetbulb (sp)? mean?
I was at Ft Leonard Wood many yrs ago for basic and advanced training and a time or two, when it got really hot and humid, they made us stay indoors or perhaps limited our activities. I think they called it wetbulb? Can anyone shed light on this? I hope someone knows what I’m talking about.
Web Bulb, Wetbulb, Web Ball, Wet Ball ???
I’m thinking it is probably an Army term meaning it is so hot and humid that activities have been curtailed?
Thanks!
I think the point is to measure temperature using the wet bulb method to get an accurate sense of what sweating human skin would feel, to see if it’s safe to be active.
http://www.zunis.org/how_hot_is_hot_how_safe_is_safe.htm
Wet Bulb Globe Temperature. The original work which served as the basis of this standard has been lost. A prominent exercise physiologist of our acquaintance has been looking for the seminal "Technical Paper" by Yaglou for more than one year, but it has disappeared. Suffice it to say that in the early 1950’s the US Marine Corps suffered significant casualties due to heat stroke during training activities at Parris Island, South Carolina. Prompted by this experience, the Department of the Navy commissioned studies on the effects of heat on exercise performance. These studies resulted in a heat index called the Wet Bulb Globe Temperature. In 1989, WBGT was suggested as an international standard (ISO 7243).
The Wet Bulb Globe Temperature is measured using three different thermometers: (1) A standard dry bulb thermometer (Dry Bulb Temperature; DB); (2) a standard dry bulb thermometer whose bulb is wrapped in a cotton sleeve, the bottom of the sleeve lying in a pool of distilled water, so that the cotton sleeve will always be wet, allowing continuous evaporative cooling of the thermometer’s bulb, simulating the evaporation of sweat (Wet Bulb Temperature; WB); and (3) a standard dry bulb thermometer whose bulb is inserted into a large (6 inch) black ball, to allow measurement of the effects of sunshine and other radiant heat (Black Globe Temperature; GT). These three temperatures are integrated as follows:
WBGT = 0.7 WB + 0.2 GT + 0.1 DB
"The wet-bulb temperature is a type of temperature measurement that reflects the physical properties of a system with a mixture of a gas and a vapor, usually air and water vapor. Wet bulb temperature is the lowest temperature that can be reached by the evaporation of water only. It is the temperature you feel when your skin is wet and is exposed to moving air. Unlike dry bulb temperature, wet bulb temperature is an indication of the amount of moisture in the air. Wet-bulb temperature can have several technical meanings:"
For air that is less than saturated (100 percent relative humidity), the wet-bulb temperature is lower than the dry-bulb temperature; and the dew point temperature is less than the wet-bulb temperature.
Cooling of the human body through perspiration is inhibited as the wet-bulb temperature (and relative humidity) of the surrounding air increases in summer. Other mechanisms may be at work in winter if there is validity to the notion of a "humid cold."
3 Responses to “In Army lingo what does wetbulb (sp)? mean?”
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April 29th, 2010 at 10:58 pm
I think the point is to measure temperature using the wet bulb method to get an accurate sense of what sweating human skin would feel, to see if it’s safe to be active.
http://www.zunis.org/how_hot_is_hot_how_safe_is_safe.htm
Wet Bulb Globe Temperature. The original work which served as the basis of this standard has been lost. A prominent exercise physiologist of our acquaintance has been looking for the seminal "Technical Paper" by Yaglou for more than one year, but it has disappeared. Suffice it to say that in the early 1950’s the US Marine Corps suffered significant casualties due to heat stroke during training activities at Parris Island, South Carolina. Prompted by this experience, the Department of the Navy commissioned studies on the effects of heat on exercise performance. These studies resulted in a heat index called the Wet Bulb Globe Temperature. In 1989, WBGT was suggested as an international standard (ISO 7243).
The Wet Bulb Globe Temperature is measured using three different thermometers: (1) A standard dry bulb thermometer (Dry Bulb Temperature; DB); (2) a standard dry bulb thermometer whose bulb is wrapped in a cotton sleeve, the bottom of the sleeve lying in a pool of distilled water, so that the cotton sleeve will always be wet, allowing continuous evaporative cooling of the thermometer’s bulb, simulating the evaporation of sweat (Wet Bulb Temperature; WB); and (3) a standard dry bulb thermometer whose bulb is inserted into a large (6 inch) black ball, to allow measurement of the effects of sunshine and other radiant heat (Black Globe Temperature; GT). These three temperatures are integrated as follows:
WBGT = 0.7 WB + 0.2 GT + 0.1 DB
"The wet-bulb temperature is a type of temperature measurement that reflects the physical properties of a system with a mixture of a gas and a vapor, usually air and water vapor. Wet bulb temperature is the lowest temperature that can be reached by the evaporation of water only. It is the temperature you feel when your skin is wet and is exposed to moving air. Unlike dry bulb temperature, wet bulb temperature is an indication of the amount of moisture in the air. Wet-bulb temperature can have several technical meanings:"
For air that is less than saturated (100 percent relative humidity), the wet-bulb temperature is lower than the dry-bulb temperature; and the dew point temperature is less than the wet-bulb temperature.
Cooling of the human body through perspiration is inhibited as the wet-bulb temperature (and relative humidity) of the surrounding air increases in summer. Other mechanisms may be at work in winter if there is validity to the notion of a "humid cold."
References :
http://en.wikipedia.org/wiki/Wet-bulb_temperature
April 29th, 2010 at 11:20 pm
Reality is right. It’s a temperature measurement system.
References :
April 29th, 2010 at 11:57 pm
Wet Bulb is what is used to measure the heat and humidity there are different categories the Army
uses to determine and prevent heat casualties,The device is on a tripod and it has 3 thermometers
used to determineheat and humidity, Distilled water is used on 1 to show humidity one to show heat and the third is used for the index there is a chart underneath to indicate each category. During deployment in Iraq this means nothing.Heat Cat 1 Unblouse 15 mikes off per hr. until there is no time in the hour.DRINK WATER!!!!!
References :