1. The density of water at room temperature is about   0.1 g/cm3   1 g/cm3   10 g/cm3   0.01 g/cm3   Hint Half-n-half Clue   2. Which of the following statements is true?   Sea water is more dense than fresh water.   Sea water may be more dense or less dense than fresh water.   Sea water has the same density as fresh water.   Sea water is less dense than fresh water.   Half-n-half Clue   3. Hot air is less dense than cold air.   True   False   4. The density of water is about 100 kg/m3 at room temperature.   True   False   5. Density is defined as   mass × acceleration   mass × volume   mass / volume   volume / mass   Half-n-half Clue   6. Which of these has the lowest density?   Cork   Glass   Aluminum   Water   Half-n-half Clue   7. The SI unit of density is   cm3/g   g/cm3   kg/m3   m3/kg   Half-n-half Clue