97687
where " P " is the inlet pressure in psi , " V " is the flow velocity in ft / s , " t " is the valve closing time in seconds , and " L " is the upstream pipe length in feet .
 s
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 s