Remove the ice cube tray and the plastic bag from the freezer and let them sit for 3 minutes. Then gently remove the piece of ice from the tray and the piece of ice from
the plastic bag. Place each piece of ice on a piece of foil. Check the pieces of ice
about every three minutes until you can clearly see whether there's a difference in
how fast they are melting. What do you
observe?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i. e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.