Pleural cavity: the cavity in the thorax that contains the lungs. Source: WordNet 2.1. Pleural cavity: cavity within the thoracic cavity consisting of the space between the parietal and visceral pleura; normally contains a capillary layer of serous fluid that lubricates the pleural surfaces.
Middle Class Average Income Range: $36,000 â $57,657. On a narrow view, a middle class family is said to have a mean average household income of $46,829 on a yearly basis. The numbers reflected on the 2010 Census showed that middle class average yearly income range from $36,000 â $57,657. Such figures fall on the third quintile.
Standard Definition: $25,000-$100,000 a year is what most would consider as a middle class income. The $75,000 spread accounts for the wide cost of living differential between places like New York City and Fargo, North Dakota.Everybody who lives in NYC or San Francisco will tell you that $25,000 a year is poor.inancial Samurai Definition Of Middle Class: If you make within +/- 50% of your cityâs household income for your age, you are middle class. For example, the average household income in San Francisco is ~$80,000.