8999
In the limit of infinite volume these internal pressures reach the value of zero : \ lim _ \ pi_T = 0 , corresponding to the fact that all real gases can be approximated to be perfect in the limit of a suitably large volume .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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