18) What is the result of a force distributed over an area?
A. volume
B. pressure
C. temperature
D. mass
19) Which of the following phase changes is an endothermic change?
A. condensation
B. vaporization
C. deposition
D. freezing
20) Boyle’s law states that the volume of a gas is inversely proportional to its pressure if the
A. temperature and number of particles are constant.
B. temperature reaches absolute zero.
C. number of particles decreases.
D. temperature and number of particles are doubled.
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