【正文】
Chapter 51. Solution:a. From inside the back cover,the mass of a cubic foot of gas in mass of particles is (100/7000)= lb, so the ratio is b. The mass of one particle is so that the number of particles isc. The logical guesses are a grain of sand or a grain of wheat. If we assume a specific gravity of 1 we can pute the diameter of a sphere which weigh a grain, finding2. Solution: The density of the sphere is its mass divided by its vol