The mean free path of molecules in a gas is:
A. the average distance a molecule travels before escaping
B. the average distance a molecule travels between collisions
C. the greatest distance a molecule travels between collisions
D. the shortest distance a molecule travels between collisions
E. the average distance a molecule travels before splitting apart
Answer: B. the average distance a molecule travels between collisions
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A. 
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C. 
D. 
E. 
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