a0a647e4_Weather__Making_Hot_and_Cold__Statement
[True or False] 9 False [Statement] 
Life preservers help people to float because they make them weigh less. False. The lightweight material of the life preserver (perhaps foam, cork or air) has a low density - relatively small mass distributed over a relatively large volume. This large volume means that the density of the life preserver and person will be significantly less that the density of the person alone in the water. The increased volume (with little increase in mass) is capable of displacing more water and so the person plus life preserver can float on the surface. To float, the weight of water displaced by an object must equal the weight of the object. The life preserver increases the amount of water that the person can displace.
Weather: Making Hot and Cold
Statement