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Hot or cold wind? With sweat or without? If you mean like a fan on a hot day (the evaporation has a cooling effect and is sped up by the air having movement, and more air being able to absorb the moisture)
Or do you mean a brisk winter breeze? (Same idea as a cold bath. If you lay still you are able to heat the water immediately around you. If you slosh around, this cannot occur, whisking the heat away as soon as you create it.
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Why do you feel cool without cloth in your body as air is bad conductor of heat?
When your skin is exposed to air, the heat from your body is transferred to the surrounding air through convection. Since air is a poor conductor of heat, the heat loss is slower, making you feel cool. Additionally, when your skin is exposed, the sweat on your body evaporates, which further helps in cooling you down.
When an individual is exposed to extremely low air temperatures the vasculature of the skin will dilate so that blood will flush into skin capillary beds and heat will be dissipated?
This is incorrect. When an individual is exposed to extremely low air temperatures, the blood vessels in the skin will constrict, a process called vasoconstriction. This reduces blood flow to the skin and helps to conserve heat in the body's core.
Does fat associated with skin prevent water loss?
No, fat associated with skin prevents heat loss. Keratin and sebum associated with skin prevent water loss.
What is the definition of windchillfactor?
Wind chill factor is a measure of the effect of wind on heat loss in exposed skin. In most environments, the human body's temperature is higher than that of the surrounding air. Where the weather is significantly cold, exposed skin heats a layer of air around it which insulates the skin from heat loss. However, a wind will blow the warmed air away from the skin and replace it with cold air. The laws of thermodynamics dictate that you lose heat energy faster the colder the thing that is draining it. Heat loss through evaporation is also a factor in increased heat loss when there is a wind. Wind chills were at one time expressed in terms of the amount of heat lost per second or minute, but people had a hard time understanding that. Nowadays it is more often expressed as a temperature, which is easy to understand, but is misleading. So you will hear "The temperature is twenty below zero but with the wind chill it is forty below", it means that because of the wind, you will lose as much heat from exposed skin as you would on a windless day where the temperature is forty below. As a result, your exposed skin will take the same amount of time to freeze. However, the temperature is still twenty below for all purposes other than calculating heat loss. The brittleness which affects steel at forty below does not happen unless the actual temperature is forty below, for example.
What is a mechanism of heat loss by the skin?
Diaphoresis, sweating
What is the mechanism to decrease heat loss at the level of the skin?
The body can decrease heat loss at the skin level by constricting blood vessels near the skin's surface to reduce heat transfer. Additionally, vasoconstriction decreases blood flow in the skin, limiting the amount of heat that is lost. Another mechanism is piloerection, where hairs on the skin stand up to create a layer of insulation.
What is the primary site of heat loss from the body?
The primary site of heat loss from the body is the skin. Its not necessarily the head or feet. It is just the skin. "The skin is the primary site of heat loss. the circulating blood brings heat to the skin's surface, where small connections between the arterioles and the venules lie directly below the skin surface. Other heat losses occur through evaporation of sweat, through warming and humidifying of inspired air and through the elimination of urine and feces." (Fundamentals of Nursing 7th edition, Taylor, Chapter 24, page 517, 2011)
What is a measure of the heat loss from skin due to increased wind speed?
One measure is the wind chill index, which calculates how cold the air feels on exposed skin due to wind speed. As wind speed increases, it enhances heat loss from the skin, making the temperature feel colder than what a thermometer reads. The wind chill index takes into account both air temperature and wind speed to estimate this perceived temperature.
Why do balloons pop when exposed to fire?
Because the heat "melts" the skin and when it all is melted it pops.
Which on is a priority for immediate decontamination from CBRN contamination?
Exposed Skin
How do capillaries help control the amount of heat lost from the body?
They dilate at the surface of the skin to release heat into the atmosphere, and they can also constrict to reduce heat loss through the skin.
What is photosensitivity?
Photosensitivity in animals is an abnormal skin reaction that occurrs when an animal has been exposed to sunlight. This is different from a sunburn. Instead the reactions can be depigmentation (loss of color) or ulceration of the skin.
