the effective concentration of a substance.
THIS PSAT VOCABULARY QUIZ IS PERFECT PRACTICE FOR THE REAL TEST
In our third teacher-created PSAT practice test there are new and unique vocabulary terms you may have never heard of! Can you guess what they mean?
Question 1 of 10
Origin of active mass
First recorded in 1905–10
Words nearby active mass
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021