Bob is investigating whether the density of water changes with temperature. In his experiment, which of the following variables would not involve a measurement?
A. volume of the water used

B. mass of the water used

C. temperature of the water

D. type of water used (bottled water or tap water)

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.