A cloth on a canteen helps cool the canteen only if it is kept wet.
When water evaporates what it is doing is changing state from a liquid state to a gaseous state. The water doesn't change temperature at all but it requires the addition of heat to change state. That heat is called the latent heat of vaporization. The latent heat of vaporization for water is 1060 BTU/lb. That is quite a bit. When the water in the canteen cover evaporates it has to draw heat from somewhere. It draws it from the canteen skin which, in turn, gets it from the canteen contents, and cooling the contents.
If the canteen cover dries the process stops and heat flows in the other direction (from hot to cold). The cover probably provides a little insulation value, but not very much.
Check this out. You might find it interesting. Fifty years ago it was not unusual to find something like this hanging from a front bumper. It looks like they are still available.
http://www.lifestylestore.com/ls_survival_water.html
None at all
If the patient is suffering from heat-stroke, cooling, shading is important. Sipping cool water will also help, but avoid very cold water. A cool cloth on the forehead, back of the neck, will also help to bring the temperature down.
You can prevent bed head from happening during the night by putting a cloth over your hair. This will help keep your hair in place.
he thinks Mr.Sir will put something in his canteen
The Art Of Putting by Stan Utley is a great book to help a person with their putting.
Actually, no i cannot. My Aunt is a doctor and she says that it cannot. It will reduce the pain but it will not help the pink eye to heal. All the heat does is numb it for a little while.
A letter of complaint should start with addressing the person the letter is being sent to, and a detailed explanation of the complaint along with any solutions that could help the problem at hand.
how do the earth's poles help cool the earth's temp
a air conditioner an cool you down
we can help the monkeys by putting them in zoos
need help putting a 1998 mitzubishi galant tranny back together
Help nervous cats by putting them in a cool, calm place where they can eat and use the litter box without interference. You can also lightly massage their forehead/top of the head with three fingers. Many also enjoy being brushed.