1. Soap bubbles are spherical in shape because   air exerts equal pressure in all directions   air trapped inside the bubble has low pressure   spherical shape has the highest ratio of surface area to volume   soap film has a low surface tension   Hint Half-n-half Clue   2. Pressure is defined as   mass / volume   force / area   force × distance   mass × acceleration   Half-n-half Clue   3. The SI unit of pressure is   Joule   Pascal   Watt   Newton   Half-n-half Clue   4. 7 Pa = _______ dynes cm-2   700000   70   7e-05   0.7   Half-n-half Clue   5. _______ states that the product of the pressure and volume of a fixed mass of gas is constant provided the temperature is unchanged.   Boyle's Law   Avogadro's Law   Charles' Law   Dalton's Law   Half-n-half Clue   6. Air is trapped in the space (labeled A) above the mercury level in the tube of a barometer, which measures 745 mm Hg. If the atmospheric pressure is 760 mm Hg, then the pressure of the trapped air is   760 mm Hg   15 mm Hg   between 745 and 760 mm Hg   745 mm Hg   Half-n-half Clue   7. 1 Pascal = 1 _______ m-2   Dyne   Newton   Joule   Erg   Half-n-half Clue