Note: caffeine and alcohol are dehydrating in the body, so try to avoid them. If you do drink them during this re-hydration program, you would need to drink an extra glass or two of water just to gain back what you will lose. 2. Drink enough water daily. In order to rehydrate a dehydrated body, you need to drink at least one-half ounce per pound of body weight daily. So, for example, if you weigh 180 pounds, you would drink 90 ounces (about 3 quarts) of water. During exercise or hot weather, you should increase your water intake significantly, depending on how much you sweat, how long you exercise, or how hot the temperature is.
How pressure decreases with altitude. As you go higher in the air, the atmospheric pressure decreases. The exact pressure at a particular altitude depends of weather conditions, but a couple of approximations and a formula can give you a general idea of how pressure decreases with altitude.
Since more than half of the atmosphere's molecules are located below an altitude of 5.5 km, atmospheric pressure decreases roughly 50% (to around 500 mb) within the lowest 5.5 km.Above 5.5 km, the pressure continues to decrease but at an increasingly slower rate. Terms for using data resources.CD-ROM available.ressure with Height pressure decreases with increasing altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.