CREATE TABLE table_34608 ("Coefficient" TEXT, "Parts-per example" TEXT, "Uno equiv." TEXT, "Symbol form" TEXT, "Value of quantity" TEXT)

What is the Coefficient of 2 ppt?
SELECT "Coefficient" FROM table_34608 WHERE "Parts-per example" = '2 ppt'
SELECT "Coefficient" FROM "table_34608" WHERE "Parts-per example" = '2 ppt'