Those materials have a specific gravity more than 1. Pure water at 4 C (the maximum density) was chosen as the accepted standard for specific gravity and given the value of 1. Some other standards set pure water at 60 F as sg = 1 so it is more correct to state the base used.
Riverside County Income and Careers. As of 2010-2014, the per capita income of Riverside County is $23,660, which is lower than the state average of $29,906 and is lower than the national average of $28,555. Riverside County median household income is $56,592, which has grown by 31.96% since 2000. The median household income growth rate is higher than the state average rate of 29.47% and is higher than the national average rate of 27.36%.
By mid-decade, the nation had reached a peak in real median household income. The U.S. ACS median household income in 2007 was $56,048. U.S. median household income decreased 8.7 percent from the 2007 ACS to the 2011 ACS and showed no change in the 2012 ACS. U.S. Census Bureau income from the 2011 ACS to the 2012 ACS. 12 The Riverside-San Bernardino-Ontario, CA Metro Area was the only area that decreased in median household income from the 2011 ACS to the 2012 ACS (2.8 percent).