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.
Here's how much you have to earn to be considered middle class. The American middle class keeps shrinking. The share of American adults in middle-income households also decreased, from 55% in 2000 to 51% in 2014, Pew Research Center reports. At the same time, the share of adults in the upper-income tier increased from 17% to 20%. Although income is just one part of class, it's a crucial element and the one that's easy to measure and track. So just how much do you need to make to qualify as middle class these days? Pew, which defines middle class as adults whose annual household income is two-thirds to double the national median ($55,775 as of 2016), details the national middle-income range for various household sizes.