Researches have recently discovered that the concentration of urine in the average swimming pool is 90 ppm. If the average public swimming pool has a volume of 830,000 L What volume of that pool is composed of urine? ​

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.