Freelancing is not just a U.S. phenomenon, but is now spreading around the world. 1  There are approximatly 53 million freelancers in the U.S. contributing $715 billion in earnings to the national economy. 2  80% of all workers in the U.S. surveyed said they would do work on the side if it came to them to earn extra money.
pH value. A number denoting the degree of acidity or of basicity (alkalinity); 7 is a neutral value; acidity increases with decreasing values below 7; basicity increases with increasing values above 7.
In chemistry, pH (/piËËeÉªtÊ/) is a numeric scale used to specify the acidity or alkalinity of an aqueous solution. It is the negative of the logarithm to base 10 of the activity of the hydrogen ion. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are alkaline or basic.