If I understand your question, you are asking how much of urine is comprised by sweat, specifically? None, as far as it can still be called sweat. Perspiration is the process of exuding fluid externally through skin pores to cool the body, and perspiration that remains on the skin either evaporates or very minor amounts may be gradually reabsorbed by the epidermis and subdermal tissues. Any residual fluid absorbed ceases to be perspiration at that point.
If you are asking instead if sweat contains urine, the answer is 0 also, though sweat does contain urea (sweat contains water, and very small, less than .01% amounts of salt, urea, sugar and ammonia). The composition of urine includes other body wastes, unlike sweat. With urine, ninety-six percent of it is water and four percent of it is waste. Remember that sweat is emitted by the eccrine sweat glands and apocrine glands, and is not emitted by the kidneys or bladder.
If you are asking instead if sweat contains urine, the answer is 0 also, though sweat does contain urea (sweat contains water, and very small, less than .01% amounts of salt, urea, sugar and ammonia). The composition of urine includes other body wastes, unlike sweat. With urine, ninety-six percent of it is water and four percent of it is waste. Remember that sweat is emitted by the eccrine sweat glands and apocrine glands, and is not emitted by the kidneys or bladder.
